The suggestion we should have a discussion on this problem is not the one he made. A. that

问题补充：

The suggestion we should have a discussion on this problem is not the one he made.

A. that, /

B. /, which

C. which, that

D. which, /

答案：

(答案→)A. that, /

B. /, which

C. which, that

D. which, /

解析：考查句子结构，第一空是同位语从句，作suggestion的同位语，从句中不缺少成分，

因此选择that，第二空是定语从句，先行词是the one，在从句中充当make的宾语，选择that或者which

或者省略，因此选择A