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【题目】They ___ do well in the exam.

A. can be able to B. be able to

C. can able to D. are able to

【答案】D

【解析】句意:他们能够在考试中做好。canbe able to 都是情态动词,但是两者不能同时连用。故选项AC错误;be able to 在具体的句子中be应该用具体的形式,不能直接写动词原形be;故排除B.they是第三人称复数形式,所以应该用are,故选D。

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