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问题: 初中英语

选择,并给出理由。另外,我想请教一下为什么vacation前有时用on,有时用for ,在什么时候用on ,在什么时候用for ?
What's she doing ______ vacation ?
She's going ______ a holiday trip.
A. on,to B.on,on C. for,on D.for,to

解答:

What's she doing __for_ vacation ?
She's going __on__ a holiday trip.
A. on,to B.on,on C. for,on D.for,to
选C.
What's she doing __for_ vacation ? 的意思是:她在为假期作什么准备。
She's going __on__ a holiday trip的意思是她正进行假日旅行。
go on a holiday,go on a holiday trip,都是固定搭配,只能靠多看多记。
所以要表示为假期做准备是你就用for,用do sth for vacation
如果说度假,你就用on,说成go on a holiday