If it ______ Professor Russel standing up for him, he would have had to leave.

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问题 If it ______ Professor Russel standing up for him, he would have had to leave.

选项 A、hasn’t been for
B、hadn’t been for
C、was for
D、were for

答案B

解析 考查if从句中虚拟语气的用法。standing up for him是已经发生的事实,所以要用过去完成时表示对过去情况的虚拟,例如:Ⅱ讧hadn’t been for the doctor’s cate,I wouldn’t have recovered so soon.(要不是医生的照顾,我不会痊愈得那么快。)
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