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9、— How could you make such a silly mistake?

— I’m sorry.I ______ it before I handed in the paper.

A.should check                                              B.could check

C.must have checked                                           D.ought to have checked

9、D

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— How could you make such a silly mistake?

— I’m sorry.I ______ it before I handed in the paper.

A.should check                                              B.could check

C.must have checked                                           D.ought to have checked

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