Is this factory ______you visited last week?为什么选C

问题描述:

Is this factory ______you visited last week?为什么选C
Is this factory ______you visited last week?
A.that B.where C.the one D.in which

this factory is [ ] (THAT) you visited last week
后面括号内是定语从句.
可见句子中少一个表语.
只有C可以做表语,A与后面THAT 重复了,不行.