—Look your father is playing the piano over there.—He be my father. He has gone to Beijing

问题补充：

—Look，your father is playing the piano over there.

—He be my father. He has gone to Beijing.

A. mustn’t

B. can’t

C. shouldn’t

D. may not

答案：

A. mustn’t

(答案→)B. can’t

C. shouldn’t

D. may not

解析：本题考查情态动词表猜测的用法。mustn’t 禁止；can’t 不可能。shouldn’t不应该；may not

也许不。---他不可能是我父亲。我父亲去北京了。