【題目】The math test is too difficult for them, so they ________ finish it.

A. can’t B. can

C. mustn’t D. must

【答案】A

【解析】句意:數(shù)學考試對他們來說太難了,所以他們完不成?疾榍閼B(tài)動詞辨析題。A. can’t不能;B. can能夠;C. mustn’t不必;D. must必須。too difficult for them對他們來說太難根據(jù)句意和語境,可知沒有能力完成,故選A。

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