单项选择题

______ a need to visit or receive advice from the clinic, arrangements should be made through the Personnel Department.

A. Should there be
B. If there is
C. For there to beC. There being
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That purpose is achieved ______ that property passes to the buyer.
A. when
B. at the time
C. the instant
D. in which time
单项选择题
Demand for cocaine in the United States, combined with the ultimately futile war on drugs, has led to the ______ in violence.
A. upsurge
B. engagement
C. extension
D. generation
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