单项选择题

The manager required that all the employees _______at the office before 9:00 in the morning.

A．will arrive
B．arrive
C．arrived
D．have arrived
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单项选择题
We occasionally have friends round for dinner but apart from that we don''t _________with others very much.
A．socialize
B．social
C．society
D．socialism
单项选择题
_______the population is too large, the government has to take measures to control the birth rate.
A．Although
B．Since
C．If
D．Until
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