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

A．canB．mustC．wouldD．need

【答案】B

【解析】本題考查情態(tài)動詞。句意：既然沒人給過他任何幫助，他肯定是獨自完成了這項研究。根據(jù)Since引導(dǎo)的從句“既然沒人給過他任何幫助”可以肯定推斷出他“一定是”自己獨立完成研究的。選B。

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