It is bad manners for you to make fun of the disabled; you should know they are in need

问题补充：

It is bad manners for you to make fun of the disabled; you should know they are in need of our understanding.

A. a; a

B. a; /

C. /; a

D. /; /

答案：

A. a; a

B. a; /

C. /; a

(答案→)D. /; /

解析：句意：你取笑残疾人是不礼貌的，你应该知道他们急需我们的理解。这里是it is bad manners for sb to do对某人来说做某事是不礼貌的；第一空是固定短语make fun of取笑某人；第二空也是固定短语in need of急需；故选D。