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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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
单项选择题
In this experiment, they are wakened several times during the night, and asked to report what they______.
A．had just been dreaming
B．have just been dreaming
C．are just dreaming
D．had just dreamt
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