—Hurry up Mum. The lights are turned on. Dad has been back.—It be him. He has gone to Sh

问题补充：

—Hurry up, Mum. The lights are turned on. Dad has been back.

—It be him. He has gone to Shanghai.

A. must

B. can’t

C. mustn’t

D. may

答案：

A. must

(答案→)B. can’t

C. mustn’t

D. may

解析：must必须，一定；can’t不能；mustn’t禁止；may可以。句意：快点，妈妈。灯已经亮了。爸爸回来了。——不可能是他。他已经去了上海。结合语境可知选B。