At school it is essential that every child equally regardless of family background. A. t

问题补充：

At school, it is essential that every child equally regardless of family background.

A. treating

B. treated

C. be treated

D. is treated

答案：

A. treating

B. treated

(答案→)C. be treated

D. is treated

解析：虚拟语气题。在句型it is essential that… 要用should do形式，should可省