单项选择题

Traffic accident is reported ______ the number-one killer of men over the past few years in this littlie town.

A．being
B．having been
C．to be
D．to have been
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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
单项选择题
The use of nuclear power is the subject of widespread ______.
A．argument
B．dispute
C．controversy
D．debate
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