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--Have you found your book yet?
--- No, I’m not sure where I________ it?
A.leaveB.had leftC.could have leftD.was to leave.
C
本题考查时态。根据句意:——你还没有找到你的书?没有,我不确定我能够把它丢哪儿了。故用could have done本能够做,选C。
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