为什么要用playing?The missing boys were last seen (playing )near

为什么要用playing?
The missing boys were last seen (playing )near the river.
A.playing B.to be playing C.play D.to play
其它答案为什么不能用?

chungking 1年前已收到2个回答举报

深山老林中的虎哥幼苗

共回答了13个问题采纳率：92.3% 举报

“正在”
翻译这个句子,应该是正在河边玩

1年前

Transfei 幼苗

共回答了510个问题举报

see doing 看到正在做什么
动名词

1年前

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你能帮帮他们吗

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