--Who's taller than Wang Bing?

问题描述:

--Who's taller than Wang Bing?
--Who's taller than Wang Bing?
--( )
A.I do B I am C Yang Ling does
请给出具体原因,

's =is
who is taller than Wang Bing?
问句中用Be动词,回答也必须有be
所以选B