单项选择题

He got home two hours late and said he had been ______ in the office by business.

A．detached
B．detained
C．obstructed
D．obsessed
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单项选择题
In a fog the ______ is very poor,
A．probability
B．flexibility
C．reliability
D．visibility
单项选择题
I come into ______with all kinds of people in my work.
A．contact
B．concern
C．complacence
D．compliance
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