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
The story was said to have been based on the information from a reliable ________.
A．source
B．foundation
C．origin
D．basis
单项选择题
Sometimes children have trouble ______ fact from fiction and may believe that such things actually exist.
A．to separate
B．separating
C．for separating
D．of separating
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