单项选择题

Those students don't have to be made ______. They are all diligent students.

A．learn
B．learned
C．learning
D．to learn
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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
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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