这一题目有点疑问请帮看下从属时态问题
原句子
Do you know who he is?
可否更改
a.Do you know who he was?
b.Did you know who he is?
c.Did you know who he was?
以上合乎逻辑否有错误请帮指正出
人气：436 ℃ 时间：2020-03-29 22:46:39
解答
c.Did you know who he was?
问你当时是不是知道他是谁.回答：
1.I knew who he was.
2.I didn't know who he was.
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