单项选择题

The secretary had the messenger ______ the envelope as soon as possible.

A． delivering
B． to deliver
C． deliver
D． delivered
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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
单项选择题
One suggestion was to______ gasoline taxes.
A． raise
B． have raised
C． be raising
D． raising
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