were there a piece of paper on the teacher's desk just now?中有何错误
问题描述：
were there a piece of paper on the teacher's desk just now?中有何错误
答
were改为was a piece of paper 是单数
答
were改成where
答
看到有人答错了,说一句,应该是was there
答
a piece of是单数 用was