------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
A．may have checkedB．might check
C．must have checkedD．should have checked
D
考查情態(tài)動(dòng)詞+have done的用法：A. may have checked可能已經(jīng)檢查了，B. might check 可能檢查了， C. must have checked一定檢查了，D. should have checked 本該檢查而沒有，句意是：--我不知道為什么他在考試中犯了這么愚蠢的錯(cuò)。--他本該交試卷錢檢查一下的。選D。
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