问题描述：
用who,whom或 which把以下每对句子改写成一句话.The car is expensive.he can not afford it.
The girl is standing besidde the window.she is a new student.
There are the presents.I bought them for my parents.
This is the old man.I helped him the day before yesterday.
The girl is standing besidde the window.she is a new student.
There are the presents.I bought them for my parents.
This is the old man.I helped him the day before yesterday.
问题解答：
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