When he was alive, the old scientist used to say that knowledge ＿＿＿＿from practic

When he was alive, the old scientist used to say that knowledge ＿＿＿＿from practice and he gained his experience by doing a lot of practical work.

A.was coming     B.had come  C.comes     D.would come

试题答案

C

解析:

宾语从句表示的是客观事实。