—_____ you swim? —Yes, but I"m not a good swimmer. [ ]A. Can B. May C. Need

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—_____ you swim?
—Yes, but I"m not a good swimmer. [ ]
A. Can
B. May
C. Need
D. Must

答案

举一反三

—Who"s the man over there? Is it Mr Black?
—It _____ be him. He"s much taller. [ ]
A. can"t
B. mustn"t
C. should
D. may

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The yellow coat _____ be Linda"s because nobody likes yellow except her. [ ]

A. can"t
B. can
C. mustn"t
D. must

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—I"m a little tired. Let"s go to the zoo by taxi.
—We _____ take a taxi. It"s not far from here. [ ]
A. can"t
B. mustn"t
C. couldn"t
D. needn"t

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—Must he finish the work before supper?
—No, he _____. He ______ finish it after supper. [ ]
A. mustn"t; may
B. needn"t; can
C. need; can
D. must; may

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—Is Mr Smith swimming in the pool, Harry?
—It _____ be him. I saw him go to the library just now. [ ]
A. may not
B. can"t
C. needn"t
D. mustn"t

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