问题
单项选择题
As there was a power failure in the hospital, the doctor had to （）operation.
A.call for
B.call off
C.call on
D.cal lout
答案
参考答案：B
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As there was a power failure in the hospital, the doctor had to （）operation.
A.call for
B.call off
C.call on
D.cal lout
参考答案：B