单项选择题

The chief of surgery became committee chairman by virtue of（）.(2014-72)

A．seniority
B．service
C．age
D．rank

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单项选择题
There were 150_____at the international conference this summer.(2010-68)
A．spectators
B．viewers
C．participants
D．onlookers
单项选择题
The employers prepares, with all due______, for a conference with the Trade Unions. (2014-79)
A．caution
B．concern
C．certainty
D．consideration
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