play-->plays 2.which-->whose
3.to that-->to whom 4.where-->that/which/不填 ，当visited的宾语，用其中的一种
5.that-->which 6.when-->that/which/不填
7.that-->where 8.which-->where
9.which-->that 10.they-->that/which
1, play 改为 plays
2, which 改为 whose
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