单项选择题

It has been quite a long time ______ the two companies established a business relationship.

A. although
B. because
C. if
D. since
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单项选择题
The house was sold for $60000, which was far more than its real ______.
A. money
B. payment
C. value
D. profit
单项选择题
It suddenly occurred to me that we could ______ the police for help.
A. ask
B. look
C. tell
D. meet
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