【題目】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:即使最優(yōu)秀的學(xué)生也做不出這道題,所以它一定很難。

考查情態(tài)動詞。must必須,一定;may可能;can能,會;need需要;根據(jù)句意理解可知,這里表達(dá)的是極其肯定的推測,表示“一定”,所以應(yīng)該用must,故選A。

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