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He won the scholarship. He______hard these terms.A、should have workedB、must hav
He won the scholarship. He______hard these terms.A、should have workedB、must hav
游客
2025-03-13
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问题
He won the scholarship. He______hard these terms.
选项
A、should have worked
B、must have worked
C、must have been working
D、could have worked
答案
C
解析
本题考查的是情态动词表示推测的情况。must表示肯定推测,接现在时表示对现在的肯定推测;接完成时则表示对过去情况的肯定推测。同样,接现在完成进行时,则表示对一直以来情况的推测。根据题意,是说他这些学期以来一定一直都很努力学习,所以选C。
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