单项选择题

If they ______ more aware of the trends, they could have avoided bankruptcy.

A． were
B． are
C． have been
D． had been
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单项选择题
One suggestion was to______ gasoline taxes.
A． raise
B． have raised
C． be raising
D． raising
单项选择题
Both companies are ______ the same business.
A． in
B． with
C． from
D． through
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