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【题目】Even the top student can't work out this problem, so it________ be too difficult.

A.mustB.mayC.canD.need

【答案】A

【解析】

句意:即使最优秀的学生也做不出这道题,所以它一定很难。

考查情态动词。must必须,一定;may可能;can能,会;need需要;根据句意理解可知,这里表达的是极其肯定的推测,表示“一定”,所以应该用must,故选A

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