- Tom where is your father?- I’m not sure. He in his office.A. must beB. may be　C. maybe

问题补充：

- Tom, where is your father?

- I’m not sure. He in his office.

A. must be

B. may be

C. maybe

D. need be

答案：

A. must be

(答案→)B. may be

C. maybe

D. need be

解析：句意：汤姆，你爸爸在哪？我不确定，他可能在办公室。A 一定是，表示肯定的推测；B 可能是；C 可能；D 必要的话；结合语境，是不太确定的推测，故选B。