【題目】—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】

考查情態(tài)動(dòng)詞。句意：——看這些腳印。一定是一只狼。我敢肯定。——你是對(duì)的!我們必須小心。A. may可能；B. must一定；C. can’t不能；D. shouldn’t不應(yīng)該；應(yīng)該不會(huì)。根據(jù)下文I’m sure about it.可知為肯定的猜測(cè)。故選B。

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