单项选择题

The defense lawyer was questioning the old man who was one of the ______ of the murder committed last month.

A．witnesses
B．audiences
C．viewers
D．observers
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单项选择题
Mr. Smith asked his secretary to ______ a new paragraph in the annual report she was typing.
A．invade
B．install
C．insert
D．inject
单项选择题
We have arranged to go to the cinema on Friday, but we can be ______ and go another day.
A．probable
B．reliable
C．flexible
D．feasible
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