This book has been in the works so long that I have lost （） of most of the sources found for me by the staff of the library. ( 章节：2 难度：3)
- A、trace
- B、trail
- C、Track
- D、touch
正确答案:C
答案解析:有
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This book has been in the works so long that I have lost （） of most of the sources found for me by the staff of the library. ( 章节：2 难度：3)
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