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Since nobody gave him any help, he________have done the research on his own.A、ca
Since nobody gave him any help, he________have done the research on his own.A、ca
游客
2024-01-14
5
管理
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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