单项选择题

You needn't worry ______ regards the cost of the operation.

A．with
B．which
C．as
D．about
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单项选择题
We've just installed two air-conditioners in our apartment, ______ should make great differences in our life next summer.
A．which
B．what
C．that
D．they
单项选择题
______ I sympathize, I can't really do very much to help them out of the difficulties.
A．As long as
B．As
C．While
D．Even
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