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  3. As there was a power failure in the hospital, the doctor had to ______the operation.

As there was a power failure in the hospital, the doctor had to ______the operation.

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问题 As there was a power failure in the hospital, the doctor had to ______the operation.
选项 A、call for
B、call off
C、call on
D、call out
答案B
解析 call off意思是“取消”。“停电”和“不得不取消手术”是因果关系，顺理成章。选项A(call for)意思是“要求某事”。选项C(call on)意思是“拜访，要求某人做某事”，选项D(call out)意思是“召集某人帮忙，使……出动”。
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