They studied what ______ since 2007 and found Australian electricity prices were - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

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

答案

解析

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。

核心考点

试题【They studied what ______ since 2007 and found Australian electricity prices were】；主要考察你对一般现在时等知识点的理解。[详细]

举一反三

Toni Morrison, Nobel Prize-winning American writer, says if there’s a book you really want to read, but it ______ yet, then you must write it.

A．hasn’t been written

B．hasn’t written

C．doesn’t write

D．isn’t written

题型：不详难度：| 查看答案

—No one answered when I phoned this morning. Where were you?
—I for teeth in the dental clinic.

A．was being treated	B．have been treated
C．was treated	D．Treated

题型：不详难度：| 查看答案

—How long have you retired, Grandpa?
—Well, four years, But you know, I for Courtaulds for over forty years.

A．have worked

B．worked

C．had worked

D．Work

题型：不详难度：| 查看答案

---- Where is mother?
---- She is in the kitchen. She ______ the housework all morning.

A．was doing

B．has done

C．has been doing

D．is doing

题型：不详难度：| 查看答案

--- 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

题型：不详难度：| 查看答案

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