She said that the building would be finished by October I doubt very much.A. thatB. this

问题补充：

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

A. that

B. this

C. when

D. which

答案：

A. that

B. this

C. when

(答案→)D. which

解析：本题考查非限制性定语从句中的关系词的用法。由前后两个分句的结构可以看出后面的句子应为修饰前面整个句子的非限制性定语从句。