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

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：本题考查的是be supposed to do sth ，故选B