单项选择题

The Allied advantage in the air gradually increased thereafter and became ______ when the United States entered the war in 1917.

A．preoccupying
B．embarrassing
C．overwhelming
D．counseling
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单项选择题
The two playwrights worked in close ______ with each other on the script.
A．collaboration
B．circulation
C．coalition
D．inspiration
单项选择题
He gave his ______ for new marketing procedures.
A．representations
B．presentations
C．comments
D．memoranda
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