题目内容

A computer can't think itself, it___ be told what to do.

A. may
B. able to
C. must
D. would

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The question is whether we____act on his advice.

A. should
B. was able to
C. ought to
D. both A and C

Hurry up. He___be waiting for us anxiously right now.

A. must
B. was able to
C. could
D. would

My MP 5 has disappeared, who ___ have taken it?

A. may
B. can
C. could
D. both B and C

You ___ never be too careful while driving a car.

A. must
B. would
C. could
D. can