单选题 --Why can't you and Sarah go to the movies tonight?
-- We are ______ a mathematics test tomorrow and I must prepare for it.
A. supposed to have B. supposedly to have
C. supposed to having D. supposedly to having

【正确答案】 A

【答案解析】——你和莎拉今晚为何不能去看电影?——我们明天要参加数学考试，我必须得做些准备。
[答题点拨] be supposed to do应该，被期望。