--Who ___to clean the blackboard __class?--The students of Team Two are

are(根据下文The students of Team Two “are”提示,be to 表将要,按计划的),
after
after class ,课后.原题是-Who ___to clean the blackboard __class?--The students of Team Two are A.am going;thisB.are going;beforeC.want;this D.would like;in the选Bbefore class 课前。this class 这节课 in the class 在教室 （in class 课上 ）be going to do sth. 将要做某事