1.What are you supposed to do when you meet someone?
2.You're not supposed to shake hands with him.
3.You should have asked what you were supposed to wear.
4.When were you supposed to arrive?
(答案不唯一)
1.What are you supposed to do when you meet someone?
2.You're not supposed to shake hands with him.
3.You should have asked what you were supposed to wear.
4.When were you supposed to arrive?
(答案不唯一)