We all like Wang Ling because he is always us and he is very helpful .A. friendly toB.

问题补充：

We all like Wang Ling because he is always us , and he is very helpful .

A. friendly toB. angry withC. mad at.

答案：

解析：be friendly to对……友好；be angry with对……很生气；be mad at痴迷于……。句意：我们都喜欢王玲，因为他对总是对我们很友好，并且他很乐于助人。结合语境可知选A。