--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
本題考查時態(tài)。根據(jù)句意：——你還沒有找到你的書？沒有，我不確定我能夠把它丟哪兒了。故用could have done本能夠做，選C。
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