问题

All passengers ______ go through safety check before they take a plane.
A:can
B:may
C:must
D:could;
B:may
C:must
D:could;
正确答案是:
同类题型
I’ve finished my assignment—Good,and ________you play or watch TV, you mustn’t disturb me
He argued ______ smoking, and insisted that it was ______argument that smoking was harmful to health
He often says, “I ____ one million smilesin my heart _____ one billion dollars in my pocket.”
________ the sun is shining at the moment,it isn’t very warm.
I toured Zhangjiajie, I was deeply impressed with its beautiful scenery