They studied what since 2007 and found Australian electricity prices were among the highest in the developed world.A．has happenedB．happenedC．had happenedD．has been happening 题目和参考答案——青夏教育精英家教网—

题目内容

They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.

A．has happened

B．happened

C．had happened

D．has been happening

考查时态。根据studied知道句子本身是过去时，2007年发生的事情正是研究的对象，说明他们是在研究之前发生的，所以应该使用过去完成时。

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—What is the price of gas these days? —Oh, it ____________ sharply since last month.

Last year I applied to Princeton University. I ________ they would say yes — but they did, and now here I am．

A．never think	B．am never thinking
C．have never thought	D．never thought

--- Julia hurt her back when she fell, and she is now in hospital.
--- Oh, really? I _____ know. I _____ go and visit her.

A．don’t; would	B．didn’t; will
C．don’t; will	D．didn’t; am going to

My sister-in-law___________ my brother for ten years.

A．married with

B．has married

C．has been married with

D．has been married to

By the time he ____ at the party, all the other guests ____ playing games.

A．arrived; had begun	B．arrived; began
C．had arrived; began	D．had arrived; have begun

Miss Jones _______ music at Bardon School for five years when she was abroad and now she is an actress.

I know Mr. Shuili; we ______ to each other at an English lecture.

A．were introduced

B．are been introduced

C．are introduced

D．had been introduced

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