---Howmuch_______theshirt?---_______thirtyyuan.A.is;It'sB.are;They'

问题补充：

---How much _______ the shirt?---_______ thirty yuan.A.is; It'sB.are; They'reC.is; They'reD.are; It's

答案：

A解析问句中主语the shirt为第三人称单数形式，故第一空应填is，那么答语的主语自然也应用表示单数的It's来指代。