单项选择题

He became aware that he had lost his audience since he had not been able to talk ______ around one topic.

A．coherently
B．initiatively
C．flexibly
D．pointedly
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单项选择题
The professor gave ______ instruction to the whole class so as to make every student understand how to conduct the experiment in the lab.
A．explicit
B．afflictive
C．authoritative
D．oblivious
单项选择题
He gradually ______ that his wife was right and he had to change his way of living.
A．explored
B．repelled
C．simplified
D．perceived
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