题目内容

You___ the work better in the future.

A. could did
B. can does
C. could do

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The room is dirty. It ____ cleaned.

A. can‘t be
B. couldn’t be
C. mustn't be

Mary ____ the exam if she studied harder.

A. can have passed
B. could have passed
C. couldn't have passed

An Englishman who ____not speak Chinese is going to live in China.

A. must
B. could
C. can

It ____ be hot in the summer.

A. can
B. couldn’t
C. can’t

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