--- Will Helen e to my party tonight?
--- I am not sure. She go to the cinema with her father.
A. shall
B. can
C. must
D. may
网友回答
A. shall
B. can
C. must
(答案→)D. may
解析：情态动词辨析。A会；B可能；C一定，必须；D也许。根据I am not sure说明她非常不确定，D的语气比B还要弱。所以D正确。句意：—Helen会来参加我今晚的聚会吗？—我不确定。也许她会陪她爸爸看电影。