【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:因?yàn)闆]有人幫助他，他一定獨(dú)自完成了這項(xiàng)研究。must表示肯定的推測，意為“一定”；符合句意。can表示推測時(shí),常用于否定句和疑問句； would have done表示對(duì)過去已經(jīng)發(fā)生的情況的不太確定的推測；need必要。

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