what are mary and linda doing?they are music.a listenb hearingc listening to
问题描述：
what are mary and linda doing?they are music.
a listen
b hearing
c listening to
答
c listening to ;
listen是不及物动词，后面必须接上to，相当于一个及物动词，再接宾语。
答
c,这是个现在进行时的对话,剩下bc可以选择,然后是词组搭配问题,只有C了