单项选择题

Doctors are now able to ______ people of many diseases, which in former time would have killed them.

A．cure
B．treat
C．had
D．recover
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单项选择题
Many a student and teacher ______ making a careful study of ______ own problems.
A．are...their
B．is...their
C．are...is
D．is...his
单项选择题
The teacher doesn't permit ______ in class.
A．smoke
B．to smoke
C．smoking
D．to have a smoke
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