单项选择题

We were heartedly arguing about the financial matter, ______ the telephone rang unexpectedly.

A．while
B．as
C．when
D．as soon as
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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
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
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