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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:考查情态动词辨析。can能; 能够; 可以; 可能。must必须; 必然要; (做出逻辑推断); (表示坚持)。would 将,将要; 愿意; 会。need必须; 不得不。句意:因为没有人给他任何帮助,他必须独自完成研究。故选B。

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