（2013·新课标Ⅱ卷)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·新课标Ⅱ卷)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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