didn't go, saw
arrived, made
joined
had gone
did, come
Have, seen
Have, been, went
was doing
had taught
1-2 CB
为你解答。
1、didn't go, had seen
2、arrived, had made
3、joined
4、had gone
5、did ... come
6、Have ... seen
7、Have...been, went
8、was doing
9、had taught
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