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
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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
单项选择题
With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.
A．that
B．which
C．but
D．as
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