【題目】

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】

試題分析：考查情態(tài)動詞。句意：既然沒有人給他任何幫助，他一定是自己做的那項研究。此處用must表示接近事實的推測。can能夠，也可以用在一般疑問句或否定句中表示推測，意為“怎么可能或不可能”；would過去常常，愿意；need需要。

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