单项选择题

When the manager went to Canada on business, his ______ took over all his duties.

A．caretaker
B．officer
C．deputy
D．commander
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单项选择题
As there was a power cut in the hospital, the surgeon had to ______ the operation.
A．call for
B．call on
C．call off
D．call up
单项选择题
The ______ estimate of gains in gross national product suggested a fast recovery from economic recession.
A．introductory
B．possible
C．primary
D．preliminary
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