单项选择题

There were 150 ____ at the international conference this summer.

A．spectators
B．viewers
C．participants
D．onlookers
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单项选择题
During the summer vacation, kids are often seen hanging _____ in the streets.
A．about
B．on
C．over
D．out
单项选择题
Due to personality _____, the two colleagues never got on well in work.
A．contradiction
B．conflict
C．confrontation
D．competition
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