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    【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】

    试题分析：考查情态动词。句意：既然没有人给他任何帮助，他一定是自己做的那项研究。此处用must表示接近事实的推测。can能够，也可以用在一般疑问句或否定句中表示推测，意为“怎么可能或不可能”；would过去常常，愿意；need需要。

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