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
Their efforts at bringing Alice and Grace together ______.
A．fell off
B．fell out
C．fell back
D．fell through
单项选择题
With his donation, we can now ______the possibility that money won't arrive when planning the program.
A．exclude
B．include
C．conclude
D．seclude
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