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职称英语
If only we ______ then the disease was curable.A、knewB、could knowC、had knownD
If only we ______ then the disease was curable.A、knewB、could knowC、had knownD
游客
2023-07-11
12
管理
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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