单项选择题

Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

A．is equal to
B．equal
C．equals to
D．is equal
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He underwent four ______ operations in two weeks.
A．excessive
B．extensive
C．intensive
D．successive
单项选择题
The current general slackness of the market has prevented us from ______ new orders with you.
A．placing.
B．putting
C．arranging
D．providing
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