这题怎么写，求学霸帮忙，必采纳！
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二
1must have been
2can't have been
3can't have been
4must have been
5can't have been
三
1seen,working
2listenning
3gets
4watching
5go
1must have been
2can't have been
3can't have been
4must have been
5can't have been
三
1seen,working
2listenning
3gets
4watching
5go
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