The first exercise should be done in class and the rest _________ at home.

题目

The first exercise should be done in class and the rest _________ at home.
这里为什么填 are to be done

答案

1.exercise泛指“锻炼”时,做不可数名词,如：take exercise 锻炼身体 take more exercise多锻炼 2.exercise表示“体操”或“练习（题）”时是可数名词,要用复数形式.如：do morning exercises（做早操）,do eye exer...