(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own. A．can B．...
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题目内容：
(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.
A．can B．must
C．would D．need
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