单项选择题

They lost their way in the forest, and ______ made matters worse was night began to fall.

A．that
B．it
C．what
D．which
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单项选择题
Care should be taken to decrease the length of time that one is ______ loud continuous noise.
A．subjected to
B．filled with
C．associated with
D．attached to
单项选择题
Give me your telephone number ______ I need your help.
A．whether
B．unless
C．so that
D．in case
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