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Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.
A.mustn’t B.ought not toC.needn’t D.don’t have to
A

试题分析:mustn’t禁止,一定不;ought not to不应该;needn’t不必;don’t have to不必;句意:看这个标志,上面写着“禁止吸烟”。你不能在这儿吸烟。太危险了。结合语境可知选A。
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