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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