I need to buy a new car and a house badly but I can't afford______
A.one B.the one C.ones D.it
那个选项比较好
我觉的是c 但是答案说是d
请给我个理由

1. 很明显one与ones都不能用，因为他们不能表示特指，the one只是其中一个不能代两个

2. it作为代词表特指，既可以代物（或是当性别不明或被认为不重要时，指人），也可以代提到过的事
如：This is my watch, it's a Swiss one.（it:my watch)
I will go to HangZhou next week.It would be a happy experience,I think. (it:go to HangZhou )

3.afford的用法要熟悉
afford to buy sth 或 afford sth. 都可以表示买得起
如：He can afford an apartment. 他能买得起一套住房。
not able to afford a new car 买不起新车

4.所以，现在你应该很明白了it所指代的是to buy a new car and a house
即：but I can't afford to buy a new car and a house
当然，如果说but I can't afford them也可以，只是选项没有