单项选择题

I will stay with you ______ there is a room free.

A．as far as
B．as long as
C．so far as
D．in case
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单项选择题
Some plants are so sensitive ______ pollution that they can only survive in a perfectly clean environment.
A．from
B．against
C．to
D．with
单项选择题
The rapid development of communications technology is transforming the ______ in which people communicate across time and space.
A．manner
B．mood
C．mission
D．vision
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