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)_做题室

单项选择题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. ( 章节：2 难度：3): A、trace; B、trail; C、Track; D、touch

正确答案：C
答案解析：
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