She’s already two hours late. What ______ to her?A．can have happened B．may have

题型：不详难度：来源：

She’s already two hours late. What ______ to her?

A．can have happened	B．may have happened
C．should have happened	D．must happen

答案

解析

can表推测，只用于否定句和疑问句中。

举一反三

He feels that his health ____ owing to ____ a long walk every other day.

A．is improving; taking	B．has been improved; being taken
C．improved; taken	D．is improving; have taken

题型：不详难度：| 查看答案

---Would you please give him the paper the moment he ____?
--- No problem.

A．arrives

B．appearing

C．came

D．reaches

题型：不详难度：| 查看答案

. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.

A．were having

B．had had

C．were to have

D．had

题型：不详难度：| 查看答案

The truth, Sir, is that the old man____ across the street when my car hit him.

A．was to walk

B．had been walking

C．walked

D．was walking

题型：不详难度：| 查看答案

Over the past decades, sea ice _______ in the Arctic as a result of global warming.

A．had decreased

B．decreased

C．has been decreasing

D．is decreasing

题型：不详难度：| 查看答案