问题描述：
"Did you know if he has\had finish his work?"一句中应是if he has还是had?
Did you know if he has finished his work?
注意：这里if是“是否”的意思
Did you know if he has finished his work?
注意：这里if是“是否”的意思
问题解答：
我来补答展开全文阅读