单项选择题

Companies are struggling to find the right ______ between supply and demand, but it is no easy task.

A. equation
B. formula
C. balance
D. pattern
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There has been a collision ______ a number of cars on the main road to town.
A. composing
B. consisting
C. involving
D. engaging
单项选择题
All the arrangements should be completed ______ your departure.
A. prior to
B. superior to
C. contrary to
D. parallel to
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