单项选择题

You should have been more patient ______ that customer; I'm sure that selling him the watch was a possibility.

A. of
B. with
C. for
D. at
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单项选择题
After scientists did some research ______ the health of workers, the government tried to find some way to meet their demand.
A. into
B. off
C. about
D. for
单项选择题
It is widely accept that young babies learn to do things because certain acts lead to ______.
A. rewards
B. prizes
C. awards
D. results
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