单项选择题

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

A．where
B．since
C．because
D．unless
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单项选择题
We______building the bridge by the end of next month.
A．are finishing
B．would finish
C．have finished
D．will have finished
单项选择题
In his opinion，success in life mainly _______on how we get along with other people.
A．keeps
B．depends
C．insists
D．spends
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