问题

This book has been in the works so long that I have lost ______ of most of the sources fou

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.

A．trace

B．trail

C．track

D．touch

请帮忙给出正确答案和分析，谢谢！

参考答案

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