问题

There is somebody knocking at the door.Who________ it be—I’m not sure. It ________ be a postman.
A:may; must
B:will; can
C:can; may
D:may; will
B:will; can
C:can; may
D:may; will
正确答案是:
同类题型
Seeing her father, the little girl ran to him, her schoolbag_________________behind her.
Must I finish myhomework now—No,you _______.
Will you please help me to _____ my income tax?
Jack often watches his favourite basketball team ________basketball in his free time.
here a few minutes earlier, he would have met that famous film star.