must have been 后什么时候加过去分词、什么时候加现在进行时，。/
答案:2 悬赏:40
解决时间 2021-04-21 18:20
- 提问者网友：浪女天生ˇ性情薄
- 2021-04-21 06:49
must have been 后什么时候加过去分词、什么时候加现在进行时，。/
最佳答案
- 二级知识专家网友：不服输就别哭
- 2021-04-21 07:03
被动语态用 must have been done 对过去的一种推测
You must have been finished your work last week.
进行时用 must have been doing
you must have been learning english for 3 years.
You must have been finished your work last week.
进行时用 must have been doing
you must have been learning english for 3 years.
全部回答
- 1楼网友：虚伪的现实
- 2021-04-21 07:23
主动 have been doing 被动 have been being done
some stamps have been being collected by them since 2000.
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