(2013·全国Ⅱ,6)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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(2013·全国Ⅱ,6)Since nobody gave him any help, he ________ have done the research on his own.
A.can | B.must |
C.would | D.need |