【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)動詞。句意:——看這些腳印。一定是一只狼。我敢肯定。——你是對的!我們必須小心。A. may可能;B. must一定;C. can’t不能;D. shouldn’t不應該;應該不會。根據(jù)下文I’m sure about it.可知為肯定的猜測。故選B。

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