单项选择题

Mr.Hamilton presided ____________ the board meeting on behalf of the Chairman.

A.at
B.over
C.in
D.on
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单项选择题
Even though we tried to cut down the cost, we realized that the low－price import would soon make the market ______.
A.saturated
B.targeted
C.boosted
D.diversified
单项选择题
The road was (enlarged )the year before the last. ()
A.Derivation
B.Conversion
C.Backformation
D.Blending
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