this is all the money with which he can buy a christmas present for his mother为什么这里填的是which

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this is all the money with which he can buy a christmas present for his mother为什么这里填的是which
this is all the money with which he can buy a christmas present for his mother
为什么这里填的是which

this is all the money with which he can buy a christmas present for his mother为什么这里填的是which
这是介词+which的形式,这种情况下只能用which,不能用that,which做主语.