Since nobody gave him any help, he________have done the research on his own.A、ca

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问题 Since nobody gave him any help, he________have done the research on his own.

选项 A、can
B、must
C、would
D、need

答案 B

解析句意：既然没人给过他任何帮助，他肯定是独自完成了这项研究。情态动词must表肯定推测，must have done意为“一定……”，故选B。

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