指出下面这句话中的错误,并说明理由Three hours are enough to look at the pictures carefully.
问题描述：
指出下面这句话中的错误,并说明理由
Three hours are enough to look at the pictures carefully.
答
“are”改成“is”
three hours指的是时间的概念,是一个整体,为不可数名词