单项选择题

He was appointed chairman of the department in _______ to Mr. Chan.

A．recession
B．succession
C．confession
D．concession
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单项选择题
We met a large _______ of whales on our voyage to Australia.
A．flock
B．school
C．herd
D．swarm
单项选择题
Due to personality _______, the two colleagues never got on well in work.
A．confrontation
B．contradiction
C．conflict
D．competition
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