.--- Where is your father? --- I'm not sure. He_______ in the office.
#75019
A
must be
B
maybe
C
may be
D
perhaps
推荐题目
          — _____ you find _______ ways to work out this problem, Jim? — Yes, I ______.
#76596
A
Could; another; could
B
Can; another; can
C
Could; other; can
D
Can; other; could
— _______ we clean the classroom at once?  — No, you _______. You _______ clean it after school. 
#78132
A
Must; needn’t; may
B
Must; mustn’t; can.
C
Shall; can’t; must
D
Need; mustn’t; may