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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单项选择题
Owing to the bad weather, the flight was _________more than one hour.
A．given
B．delayed
C．stopped
D．disturbed
单项选择题
Last night a fire_________ in that market, so the firm suffered a heavy loss.
A．broke up
B．broke out
C．broke off
D．broke down
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