If they don't understand it the first time, over it again until they do． [ ] A．going B．to go C．gone D．go 题目和参考答案——青夏教育精英家教网—

题目内容

If they don't understand it the first time, ________ over it again until they do．

[　　]

A．going

B．to go

C．gone

D．go

答案：D
解析：

横线前if引导的是一个条件状语从句，而在横线处无论是填A、B或C项，都是一个非谓语动词短语，而不是一个句子，这样一来，整个句子没有主句，从而导致结构不完整。若选D项，则go over it again until they do是一个句子(祈使句)，在此用作整个复合句的主句。

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The Student Network has student leaders who deal with the most pressing environmental issues．We have organized and won inspiring campaigns．Convincing corporations to change their ways and politicians to do the right thing．All thanks to our team of leaders, known as Campus Coordinators．

Campus Coordinators are located all across the United States, and even Canada! They work on Greenpeace Student Network campaigns at their schools and in their communities．They organize events like film screenings and days of action．They hold meetings with elected officials, work with the media, recruit（招募） volunteers, and mobilize（动员） their campus to take action! They do all of this with excellent training and expert support from our team of Student: Network staff．Campus Coordinators develop their leadership skins and become an unstoppable force for green solutions on pus and in their community．

Currently, the Greenpeace Student Network is campaigning to solve the largest environmental threat to humankind: global warming．With only months until a new international treaty（协议）on global warming is decided this December, the time to stand up and take the lead has never been

more important,

If you are concerned with environmental issues, want to mobilize your scho4l and community, nd are ready to become a skilled organizer and strong leader, then the Campus Coordinator position is for you! We are now accepting applications for the Fall 2009-Spring 2010 academic year．

Are you ready to be a leader on your campus?

Apply to be a Campus Coordinator today!

Why does the author write the passage?

A．To describe the serious environmental problems．

B．To call on students to apply to be Campus Coordinators,

C．To explain the advantage of the Greenpeace Student Network．．

D．To stress the importance of solving environmental problems．

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A．is a place where school leaders are framed

B．is a worldwide organization helping student leaders

C．helps solve corporations' economic problems

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B．The distribution of Campus Coordinators．

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There have been many cases where people fall to their deaths from high-rise flats. Children often fall from staircases while coming down the stairs. Old people may slip on wet or slippery floors if they are not careful.

Nowadays there are a lot of modern electrical appliances such as rice-cookers, electric irons, and kettles which make life easy for the modern housewives. These appliances can kill if they are not used in the proper way.

Gas stoves used for cooking are also dangerous if they are not properly handled. They may cause burns or, in more serious cases, they may even cause fires.

But all such accidents can be prevented if we are careful and obey simple rules of safety. For example, it is unwise for people to try repairing their own electrical appliances if they do not know how. It is safer for them to get their faulty appliances repaired by a qualified electrician.

People think accidents happen only on the roads or highways because ______.

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D. such accidents happen nearly every day

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C. Gas stoves may cause burns or even fires.

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