题目内容

–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

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--- Could I sit here?

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

It is lucky for him to _____ get the job.

A. be able to
B. could
C. can

I _____ promise you anything.

A. cannot
B. canot
C. could’not

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