作业帮I don't know why he took part in the walk.I don't know ________he took part in the walk__________.
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I don't know why he took part in the walk.I don't know ________he took part in the walk__________.
I don't know why he took part in the walk.
I don't know ________he took part in the walk__________.
I don't know why he took part in the walk.I don't know ________he took part in the walk__________.
I don't know what he took part in the walk for?我不知道他们参加步行的目的是什么?
Why...?==What...for?
what for;
what for:....原因