If we__________the plans carefully，we would not have erred so seriously．

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问题 If we__________the plans carefully，we would not have erred so seriously．

选项 A、had studied
B、study
C、studied
D、were studying

答案A

解析与过去事实卡甘反的虚拟语气if从句中的动词用过去完成时。B是一般现在时，C是一般过去式，D是过去进行时。

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