问题补充：
--There is a new film on, will you finish your homework before 7:00 tonight?
--I’m afraid I . I have too much homework today. Let’s see the movie this weekend!
A. can; can’t
B. be able to; can’t
C. may; am not able to
D. could; may not
答案：
A. can; can’t
(答案→)B. be able to; can’t
C. may; am not able to
D. could; may not
解析：句意：有一部新电影在放映，今晚七点前你能完成你的作业吗？恐怕不能，今天作业太多，让我们这个周末去看吧。be able to=can,能够，故选B。
