单项选择题

Some companies might not let you rent a car（）you have a credit card.

A．where
B．because
C．since
D．unless

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单项选择题

（）I am concerned, it is important to get a job first.

A．As long as
B．As well as
C．As soon as
D．As far as

单项选择题

It is obvious that these small businesses are（）need of technical support.

A．in
B．on
C．with
D．to

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