Cars and buses________ stop when the traffic lights turn red.[ ]A. can

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Cars and buses________ stop when the traffic lights turn red.[     ]
A. can
B. need
C. may
D. must

答案

举一反三

—It is nearly six p.m. Will you have dinner here?
—Sorry, _______. I have many things to do.[ ]
A. I mustn"t
B. I can"t
C. I needn"t
D. I don"t

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—Must I finish the work before" clock?
—No, you _______.[     ]
A. needn"t
B. mustn"t
C. have to
D. can t

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Henry___________ be at home because he phoned me from the farm just now.[     ]
A. mustn"t
B. isn"t able to
C. may not
D. can"t

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—Must we finish the homework before six?
—No ,you ____. You may do it tomorrow. [ ]
A. mustn’t
B. may not
C. needn’t
D. can’t

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You ________ go and help him with the housework. [ ]
A. don"t need
B. not need
C. needn"t to
D. needn"t

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