2. 外语
  3. 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.

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.

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问题 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.
选项 A、track
B、trail
C、trace
D、clue
答案A
解析 固定搭配题。lose track of意为“失去与…的联系；失去…的线索”。选项B trail意为“踪迹，痕迹，足迹”；选项C trace意为“痕迹，遗迹”；选项D clue意为“线索，助于解决问题或迷惑的某物”。所以正确答案为A 。
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