the missing boys were last seen__near the river

the missing boys were last seen__near the river
playing to be playing play to play

blanktears 1年前已收到1个回答举报

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共回答了19个问题采纳率：89.5% 举报

to be playing
be seen to do这是一种特殊句式
see to do sth改为被动是就成为 be seen to do
were 表示正在做什么 ,因此用to be playing .

1年前

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