单项选择题

Falling sales and rising overheads have obliged the company to review each customer's ______ limit.

A．credit
B．currency
C．check
D．certificate
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单项选择题
You cannot be ______ careful when you drive a car.
A．very
B．so
C．too
D．enough
单项选择题
Recently the car factory had to carry out personnel ______ because of financial trouble.
A．cuts
B．demands
C．reductions
D．orders
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