Question

We have 3 rooms ____________ , but I can’t decide ____________

1. A.
   to live, to choose which one
2. B.
   lived, choose which one
3. C.
   to live in, which one to choose
4. D.
   live, which one

Answer 1

C
动词不定式只能做后置定语.不能做前置定语。动词不定式与所修饰的词之间往往有动宾关系,如果该不定式是不及物动词,或者该不定式本身有宾语,后面应有必要的介词.live本身不能表示住在哪里，因此后面需要加上表示位置的介词，在……里面。因此选C。