What the science teacher does and says of great importance to college students.A. wasB. a

问题补充：

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

A. was

B. are

C. is

D. were

答案：

A. was

B. are

(答案→)C. is

D. were

解析：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。