I have not found my book yet. I'm not sure ____ I could have done with it. ( 章节：2 难度：2)
- A、whether
- B、what
- C、why
- D、where
正确答案:B
答案解析:有
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I have not found my book yet. I'm not sure ____ I could have done with it. ( 章节：2 难度：2)
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