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．track
B．trail
C．trace
D．clue
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单项选择题
The use of nuclear power is the subject of widespread ______.
A．argument
B．dispute
C．controversy
D．debate
单项选择题
His proposal that a special committee ______ to investigate the incident was flatly denied by the director of the bureau.
A．was set up
B．be set up
C．set up
D．being set up
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