单项选择题

Careful surveys have indicated that as many as 50 percent of patients do not take drugs______ directed.

A．like
B．so
C．which
D．as
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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
The law requires that everyone______ his car checked at least once a year.
A．has
B．would have
C．have
D．will have
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