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【题目】—Look at these tracks. It ________ be a wolf. I’m sure about it.

—You are right! We have to be careful.

A.mayB.mustC.can’tD.shouldn’t

【答案】B

【解析】

考查情态动词。句意:——看这些脚印。一定是一只狼。我敢肯定。——你是对的!我们必须小心。A. may可能;B. must一定;C. can’t不能;D. shouldn’t不应该;应该不会。根据下文I’m sure about it.可知为肯定的猜测。故选B

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