单项选择题

Britain might still be part of France if it weren't （）a disastrous flood 200000 years ago, according to scientists from Imperial College in London.

A. upon
B. with
C. in
D. for

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单项选择题
Congress was then in session, and a fierce （） was going on over ratification of the treaty.

A. debate
B. discussion
C. quarrel
D. contention
单项选择题
The company management attempted to （）information that was not favorable to them, but it was all in vain.

A. supplement
B. suppress
C. plug
D. concentrate
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