I have not found my book yet. I’m not sure ______ I could have done with it.

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问题 I have not found my book yet. I’m not sure ______ I could have done with it.

选项 A、why
B、where
C、whether
D、what

答案D

解析 第一句说他找不到书了,暗示第二句应该是他不确定他以前怎么处置这本书了。注意到第二句缺一个宾语,所以选D。
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