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If the operation ________ carefully prepared, it would not have been successful.

A.was not
B.has not been
C.had not been
D.were not

查看答案

正确答案： C
答案分析：语法题：虚拟语气。

包含此试题的试卷：

2018年10月自考英语阅读(二)真题试题及答案解析

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