问题
If you _____ smoke, please go outside 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
Everyone knows that China is famous theGreat Wall in the world.
Can’t you stay a little longer—It’s getting late. I really _____ go now. My daughter is home alone.
I’m going shopping. Do you have anything ________
It was _____ impossible for anyone to get admitted without the password.
Passengers are permittedonly one piece of hand luggage onto the plane