单项选择题

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

A．an operation
B．an emergency
C．a treatment
D．an incident
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单项选择题
There was a teapot fashioned like a china duck, out of ______ open mouth the tea was supposed to come.
A．which
B．its
C．that
D．whose
单项选择题
A ______ of the long report by the budget committee was submitted to the mayor for approval.
A．shorthand
B．scheme
C．schedule
D．sketch
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