() they are!A、how excting B、how excited C、 what excting D、what excited

问题描述:

() they are!A、how excting B、how excited C、 what excting D、what excited

B
how+adj. excited形容人

B
they指人,ed分词修饰人

人用ed,物用ing.they指代的是人,应以ed结尾,排除A和C.
how+形容词或副词+主语+谓语,what+名词词组+(主语+谓语),故应选B.