问题

_____ smoke, please gooutside because this is a non-smoking office.
A:must
B:should
C:can
D:may
B:should
C:can
D:may
正确答案是:
同类题型
I ______ this book for two weeksI have to return it now
You are late again, Tom? — Sorry, but I got ________ a heavy traffic jam.
What do you think of the reason _____ he gave at the meeting yesterday
The performance _______ three hours but none of us wanted to leave earlier.
Every evening after dinner,if not ________ from work,I will spend some time walking my dog.