选择填空：The rest of the students -------- not allowed to leave the classroom at that time.

题目

选择填空：The rest of the students -------- not allowed to leave the classroom at that time.
A are
B is
C was
D were

答案

选择D,第一,关键词the rest of the students 说明主语是复数,故可以排除B与C,因为B和C主语要求都是单数,或者主语是作为一个整体时,明显这里指的是剩下的那群学生,故用复数,剩下的是are与were,楼主请看at that time,在那时,说明时间已经过去了,所以很明显,谓语要用过去时,整句话的意思是（在那时,剩下的学生都被要求就在教室里,也就是不让离开教室）
不知道楼主懂了没,不懂再补充下哪里还没有清楚的,