the house and the furniture -------- sold out,选下面哪个

问题描述:

the house and the furniture -------- sold out,选下面哪个
请说明原因A. was B. were ,主谓怎么搭配
furniture是可数还是不可数的呢
既然是不可数的,为什么还用复数形式

furniture是不可数的.
答案是B.