单项选择题

Don't worry about it. Sometimes the symptoms can be quite ______.

A．severe
B．light
C．mild
D．weak
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单项选择题
He is ______ tearing up what he has written and beginning over again.
A．simply
B．constantly
C．gradually
D．generally
单项选择题
As a policeman, Mr. Brown thought that he had a duty to ______ the lost children in finding their homes.
A．assist
B．help
C．provide
D．support
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