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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单项选择题
He was employed as an interpreter because he was ______ in three languages.
A．intimate
B．proficient
C．efficient
D．sufficient
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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