All flights ___________ because of fog. I’m afraid you will have to stay here for another day.

A. had been put off B. called off

C. have been called off D. have put off

C

【解析】

試題分析：call off 取消，停止行動； put off 推遲，延誤 。根據(jù)第二句的時態(tài)可知第一句的時態(tài)應(yīng)為現(xiàn)在完成時，A為過去完成時，不符合；flights 作句子的主語，要用被動語態(tài)，B和C是主動語態(tài)，排除；C項為現(xiàn)在完成時的被動語態(tài)，符合語境，故選C。

考點：考查被動語態(tài)、動詞短語

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