The first use of atomic weapons was in 1945. and their power _____ increased eno

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The first use of atomic weapons was in 1945. and their power _____ increased enormously ever since.

A．is

B．was

C．has been

D．had been

答案

解析

略

举一反三

Water _____ at 100 degrees centigrade.

A．boiled

B．boils

C．has boiled

D．was boiling

题型：不详难度：| 查看答案

The boy _____ out to play until he had finished his homework.

A．went

B．would go

C．doesn’t go

D．didn’t go

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By August the flowers _____.

A．die

B．will die

C．are to die

D．will have died

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Fetch a doctor! The patient _____.

A．was dead

B．has dead

C．died

D．is dying

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We were all surprised when he made it clear that he _____ office soon.

A．leaves

B．would leave

C．left

D．had left

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