In China students greet the teachers when classes begin.A. are suppose toB. are supposed t

问题补充：

In China students greet the teachers when classes begin.

A. are suppose to

B. are supposed to

C. suppose

D. supposed to

答案：

A. are suppose to

(答案→)B. are supposed to

C. suppose

D. supposed to

解析：此句的含义是在中国，学生们在上课前应该欢迎老师。考查的结构是be supposed to do sth意思是应该做某事，因主语students是复数形式，系动词be应用are，故选B。