Every desk and every chair ____(be) made of wood ,用BE的适当形式填空

题目

Every desk and every chair ____(be) made of wood ,用BE的适当形式填空
这里的BE动词究竟该用IS还是ARE,请选择并且说说理由

答案

答案是are,因为 every desk and every chair ,意思是每张凳子和每张椅子,两种东西做主语；如果改成every desk and chair的话,意思是每套桌椅,是一个整体看作是单数,那样就得用is啦.OK?