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.

A. trace
B. trail
C. track
D. touch
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The elbows on your coat have worn thin, so I must _____ them.
A. mend
B. patch
C. repair
D. pitch
单项选择题
Setting up a committee might be a way ________ the project more efficiently.
A. to be doing
B. doing
C. to do
D. being done
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