He be at home because the light is on.A. mustB. can’t C. can D. might

问题补充：

He be at home, because the light is on.

A. must

B. can’t

C. can

D. might

答案：

(答案→)A. must

B. can’t

C. can

D. might

解析：must必须，一定；can’t不能；can能够；might可能。联系下文，因为灯亮着。可知上文意思是，他一定在家。故选A。