When the Kangaroo's players went home,they were proud that they had done their best. that 引导的句子做they的主语补足语,补充说明主语they的状态. 上面的话是错的.that 引导的句子在这句中是系表宾从.根本不是主语补足语,不会别乱讲.
=== When the Kangaroo's players went home, they were proud that they had done their best. that 引导的句子做they的主语补足语,补充说明主语they的状态。(从when到best的整个句子是时间状语从句。)