We have 3 rooms ____________ , but I can’t decide ____________
A.to live, to choose which one
B.lived, choose which one
C.to live in, which one to choose
D.live, which one
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C解析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。