Question

What the science teacher does and says ____ of great importance to college students. 

A．was

B．are

C．is

D．were

Answer 1

C

考查主谓一致。名词性从句中主语从句做主语时，谓语动词用单数，句意：科学老师所做的和所说的对大学生来说非常重要。所以选C。