题目内容

Mary ____ the exam if she studied harder.

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

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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

–Who is the man over there? Is it Mr. Li?

A. No, it ______ be him. Mr. Li is much taller.
B. mustn’t
C. could not
D. can’t

--- Could I sit here?

A. -Yes, of course you _______.
B. can
C. could
D. must