用适当的介词填空.
题目
用适当的介词填空.
Can we buy this car ( ) instalments?
I have been here ( ) about three months.
you can pay a deposit ( ) fifty dollars.
Where did you put the key ( ) this door?
There are lots of people ( ) the room.
答案
Can we buy this car ( with ) instalments?
I have been here ( for ) about three months.
you can pay a deposit ( of ) fifty dollars.
Where did you put the key ( to ) this door?
There are lots of people ( in ) the room.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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