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

问题补充：

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

A. are

B. is

C. were

D. was

答案：

A. are

(答案→)B. is

C. were

D. was

解析：考查谓语动词单复数，句子作主语时，谓语动词用单数，句子意思“学科老师所做的和所说的对于大学生很重要”，所以选B