来自童明成的问题
Ithinkmuchattention__yourpronunciation.a,mustbepaidtob,oughttobepaidtoc,maybepaidtod,shouldbepaidto,为什么选a不选b或d呢?
Ithinkmuchattention__yourpronunciation.
a,mustbepaidtob,oughttobepaidtoc,maybepaidtod,shouldbepaidto,为什么选a不选b或d呢?

