单项选择题

Mr. Forbes cannot come to the charity dinner because he has ______ business to deal with.

A．critical
B．plausible
C．reliable
D．noticeable
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单项选择题
The crash investigators were unable to ______ why the truck veered onto the lefthand side of the road.
A．access
B．ascend
C．accede
D．ascertain
单项选择题
Diplomats should do their best to ______ the reputation of their country while on overseas assignments.
A．enhance
B．advise
C．broadcast
D．reward
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