单项选择题

You ______ that letter to James. However, you didn't.

A．ought to write
B．ought to have written
C．should write
D．should be writing
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单项选择题
To their credit the Department of Energy ______ these ideas and funded a detailed study.
A．took over
B．took on
C．took up
D．took to
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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