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    精英家教网 > 高中英语 > 题目详情

    【题目】 Since nobody gave him any help, he __________ have done the research on his own.

    A. can

    B. must

    C. would

    D. need

    【答案】B

    【解析】句意:既然没人给予他任何帮助，他一定是独自完成这项研究的。本题考查情态动词。must have done表示对过去情况的肯定推测，意为“一定做了”，符合语境。can表推测通常用于疑问句和否定句；would have done表示与过去事实相反的假设，通常用于虚拟语气中；need和have done连用时常用否定形式needn't have done“本没有必要做某事（而做了）”。

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