--- Who it be that is singing in the next room?
--- It be Lucy, but I am not sure.
A. can ; may
B. may ; can
C. can; must
D. must; may
网友回答
(答案→)A. can ; may
B. may ; can
C. can; must
D. must; may
解析：考察情态动词。第一空用can表示可能性，can通常用于疑问句和否定句中。第二空用may，在肯德基中表示可能性很小的推测。句意：—在隔壁唱歌的会是谁呢？—也许是Lucy，但是我不确定。故A正确。