题目内容

8. 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

8. C call for意为"接(某人) ;取(某物) ;需要"; call on意为"号召,呼吁;邀请;拜访";call off 意为"取消";call up意为"召唤;使想起;提出;打电话"。

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