用before连接：He opend the window?He closed the door first?(before)
这句话中前半部是什么时态后半部又是什么时态：I had made an appointment before I went see the dentist.
人气：489 ℃ 时间：2020-03-23 08:44:23
解答
he had closed the door before he opened the window,
一样都是：前半部过去的过去,所以用过去完成时,后面是一般过去时
.
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