问题补充:
-- you come to my birthday party tomorrow, Robert?
--I’m afraid not. I have to study for my exam.
A. Must
B. Should
C. Can
D. Need
答案:
A. Must
B. Should
(答案→)C. Can
D. Need
解析:A.必须,一定 B . 应该,就 C.能,可以D.需要。句意:明天你能来参加我的生日聚会吗?罗伯特。——我恐怕不能。我要为我的考试学习。故选C。