【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】句意:既然沒人給予他任何幫助，他一定是獨(dú)自完成這項(xiàng)研究的。本題考查情態(tài)動(dòng)詞。must have done表示對過去情況的肯定推測，意為“一定做了”，符合語境。can表推測通常用于疑問句和否定句；would have done表示與過去事實(shí)相反的假設(shè)，通常用于虛擬語氣中；need和have done連用時(shí)常用否定形式needn't have done“本沒有必要做某事（而做了）”。

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