The mayor announced that the tallest building would be built in our city.but when and where till now．( )A．haven't been decidedB．hasn't been decidedC．are not decideD．is being decided 题目和参考答案——青夏教育精英家教网—

题目内容

15．The mayor announced that the tallest building would be built in our city，but when and where ____________ till now．（　　）

	A．	haven't been decided		B．	hasn't been decided
	C．	are not decide		D．	is being decided

分析市长宣布在我们城市将建筑最高的大楼，但是直到现在何时何地尚未决定．

解答答案是B．本题考查现在完成时；题干中的till now（直到现在）是现在完成时的标志词，"何时何地"是一个整体概念，是被决定，所以谓语动词用单数现在完成时的被动语态，故选B．

点评对时态的选择，要在把握时态的基本用法的基础上，根据具体语境和题干中的时间推断时态，同时关注特殊的结构．

练习册系列答案

6．Ways to live a happy life
If you want to change something for better，you should realize that it's the high time to take advantage of both positive and negative things，which take place in your life．Check out a few smart ways to live a happy life．
（36）D
Those people who lead a happy life tend to keep a still tongue in their heads．I think it's a wise decision，because careless words can sometimes cause problems around you．Plus，if you are out-going by nature，you should take this advice into consideration．
Focus on your issues．
I don't know why，but people love to waste time making judgments and talking about others．（37）E Instead，turn your energy to all your own business．When you start minding your business，you'11be able to enjoy more simple life pleasure．
Keep positive people around．
The circle of contacts plays a significant role in your life，as you have common values and aims．（38）CFind those who will notice your special quality and help you spread your wings and fly．
Practice kindness．
Kindness is one of the best human personalities and it has a great number of advantages．（39）GIf you set kindness as your main life concern，you'll get on well with this world and with yourself．
You have all chances to move on．（40）B You should always remember that the one who keeps going will achieve all desired things．

A．Accept your past．
B．Get rid of things that let you down．
C．Every person is unique and talented．
D．Don't let your tongue create problems．
E．Don't waste your time on useless things．
F．Give away money，time and energy without regrets．
G．It's important to be kind in your attitude to the society．

3．On account of fuel supplies being finite and many people being wasteful，we will have to install ________ solar heating device in our home．（　　）

10．David knocked at the door for nearly half an hour______Mary opened it，unwilling．（　　）

20．--We'll go to the Egyptian art collection on display at the museum at 9tonight．Could you join us？
--I'm afraid I can't．I ______________ the paper with my tutor then．（　　）

	A．	am discussing		B．	have discussed
	C．	will have discussed		D．	will be discussing

7．The new stadium being built in our city for the next Asian Games will be _____ the old one．（　　）

	A．	as big as twice		B．	twice as big as
	C．	as bigger as twice		D．	twice as bigger as

4．-Could I have the small table by the window？
-Sorry，sir．It ______ in advance．（　　）

5．Police are now searching for a woman who is reported to since the flood hit（　　）

	A．	have been missing		B．	have got lost
	C．	be missing		D．	get lost

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