We all think it is Mr Wang as well as his parents that for his son’s bad performance at s

问题补充：

We all think it is Mr Wang as well as his parents that for his son’s bad performance at school.

A. are to blame

B. is to be blamed

C. are to be blamed

D. is to blame

答案：

A. are to blame

B. is to be blamed

C. are to be blamed

(答案→)D. is to blame

解析：