定语从句

Is this college ____they went to last year?

A that B which C the one D the one what

请问这里为什么不需要A，这句疑问句还原成陈述句是如此吗？

This is college ____they went to last year.

college为可数名词，单数的时候不可以用零冠词（即需要有限定词）。你选A，还原的陈述句中college 没限定词，为错误。

所以，只能选C。还原为陈述句后为：

This college is the one they went to last year.

one 在这里为名词替代词，the one=the college. 后面的定语从句省略了作介词宾语的关系代词that或which。