they___(dance) in the playground now.为什么填are dan

they___(dance) in the playground now.为什么填are dan
they___(dance) in the playground now.
为什么填are dancing不填have been dancing?
句中有now就要用现在进行时吗?什么时候用现在完成进行时?

xiao_junjun 1年前已收到1个回答举报

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欧阳昌幼苗

共回答了17个问题采纳率：94.1% 举报

用现完一般是持续发生一个动作从过去一直到现在都在发生.这个dancing只能说明现在发生没有前提告诉你过去一直发生

1年前

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