单项选择题

There were 150_____at the international conference this summer.(2010-68)

A．spectators
B．viewers
C．participants
D．onlookers
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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
单项选择题
They’ve lifted a two-year-long economic______on the country.(2011-76)
A．enclosure
B．restriction
C．blockade
D．prohibition
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