单项选择题

With all the data he needed ______, Peter began to write his thesis.

[A] collecting
[B] being collected
[C] to be collected
[D] collected
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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
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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