If only we ______ then the disease was curable.

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问题 If only we ______ then the disease was curable.

选项 A、knew
B、could know
C、had known
D、would have known

答案C

解析 if only引导的句子用虚拟语气，表示过去的情况用过去完成时。

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大学英语四级

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