Since nobody could help Mary with her study, she________ have finished it by herself.
A.can | B.need | C.must | D.should |
更新时间:2021-07-17 11:48:56
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【知识点】 must have done的用法
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【推荐1】 --- Tom , why didn’t you answer my call yesterday afternoon ?
--- Sorry , I didn't hear the phone . I ___________ asleep.
--- Sorry , I didn't hear the phone . I ___________ asleep.
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C.could be | D.should have been |
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【推荐2】—The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
—Oh, dear! She ______ a lot of difficulties!
—Oh, dear! She ______ a lot of difficulties!
A.may go through | B.might go through |
C.need have gone through | D.must have gone through |
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