Stave said that if he had known how it worked,he would have been told

Stave said that if he had known how it worked,he would have been told

题目
Stave said that if he had known how it worked,he would have been told
答案
这是一个third conditional的句子阿叫做 pass future perfect:过去将来完成时-----------------if he had known how it worked,这后半句用了被动啊 he would have been told-----------------抛开句意原来应该是 if...
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