It’s a rule in our school that the classroom _________ every day.A.should clean B.should be cleaned C.should cleaned D.should be cleaning.A.should clean B.should be cleaned C.should cleaned D.should be cleaning
问题描述：
It’s a rule in our school that the classroom _________ every day.
A.should clean B.should be cleaned C.should cleaned D.should be cleaning
.A.should clean B.should be cleaned C.should cleaned D.should be cleaning
答
B
答
choose B
答
b吧
答
B
教室是被打扫，用被动语态
答
选择B其中should可以省略,直接填be cleaned也可以.这是表示规则,命令的用法,除了用名词rule,requirement,order等,也可以用动词require等.如：We are required that the classroom (should) be clean every day.至于...
答
B （passive voice）
A之所以不对是因为它是active voice
C should後面的动词用原型
D 放进句子中根本就不符句意