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问题: 情态动词回答

-It is rather cold here.Shall we light a fire?
-No,we _,because things are easy to catch fire.
A.wouln't
B.don't
C.mustn't
D.needn't
tell me why

解答:

从后文things are easy to catch fire来看,应该是比较肯定的语气,所以要选C.mustn't,既“不允许”之意。