She said that the building would be finished by October,________ I doubt very much．

She said that the building would be finished by October,________ I doubt very much．

A.that

B.this

C.when

D.which

答案及解析： D

解析：

本题考查非限定性定语从句中关系词的用法。由前后两个句子结构可看出后者是修饰前面整个句子的非限制性定语从句。而从句中缺宾语，that不用来引导非限制性宾语从句，this，that不能引导从句。