单项选择题

The doctor was asked to go back to the hospital because of ______ case.

A．an operation
B．a treatment
C．an emergency
D．an incident
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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
I would rather you ______ tomorrow than today.
A．not come
B．won't come
C．don't come
D．came
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