—Look at the boy running on the ground. Is it Davis? —It _____ be him. I saw him

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—Look at the boy running on the ground. Is it Davis?
—It _____ be him. I saw him go to the teacher"s office just now. [ ]
A. must
B. can"t
C. could
D. might

答案

举一反三

—Bill, is the pink umbrella Anna"s?
—No, it _____ be hers. Hers is purple. [ ]
A. might
B. must
C. can"t

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This history book _____ be Bob"s sister"s. His sister is only a baby. [ ]
A. must
B. might
C. can"t

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—I can"t stop smoking, doctor.
—For your health, I"m afraid you _____.

[ ]

A. may
B. need
C. have to
D. must

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You have already tried your best, so you _____ worry about the matter. [ ]
A. can"t
B. needn"t
C. mustn"t
D. couldn"t

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—_____ I borrow your MP3?
—Sure. Here you are. [ ]
A. May
B. Should
C. Must
D. Would

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