2. 外语
  3. If only we ______ then the disease was curable.

If only we ______ then the disease was curable.

admin2013-06-17  19
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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