There are five pairs ,but I am at a loss which to buy.A.to be chosen B.to choose from C.to choose D.

题目

There are five pairs ,but I am at a loss which to buy.A.to be chosen B.to choose from C.to choose D.for choosing 结束 请问前面的英语句子中,问号处应该填哪个选项?

答案

C
这个是不定式作后置定语,
“可以选择的5双”