问题
选择题
---Have you found your book yet?
---No. I’m not sure where I ___it.
A．leave
B．had left
C．could have left
D．was to leave
答案
答案：C
could have done “本能做某事实际没做”句意：你找到你的书了吗？没有。我不确定我能把它放哪？
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