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

题型：不详难度：来源：

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

答案

C

解析

宾语从句表示的是客观事实。