(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 |
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