2. 自考
  3. If the operation______carefully prepared，it would not have been successful.

If the operation______carefully prepared，it would not have been successful.

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问题 If the operation______carefully prepared，it would not have been successful.
选项 A、was not
B、has not been
C、had not been
D、were not
答案C
解析 虚拟语气的被动语态，had+been+过去分词。
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