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It'sthefirsttimethatIhavemethim.为什么havemet不能用met?

题目详情
It's the first time that I have met him.为什么 have met 不能用met?
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答案和解析
固定句型,必修一Unit1
It is the first time that +现在完成时
It was the first time that +过去完成时