Since nobody gave him any help，he ________ have done the research on his own.
(2013·大纲全国，26)
| A．can | B．must |
| C．would | D．need |
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Since nobody gave him any help，he ________ have done the research on his own.
(2013·大纲全国，26)
| A．can | B．must |
| C．would | D．need |
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