问题补充:
--Sorry, I have to now. It is time for class.
--- OK, I’ll call back later.
A. hang up
B. break up
C. give up
D. hold up
答案:
(答案→)A. hang up
B. break up
C. give up
D. hold up
解析:短语辨析。A. 搁置;拖延;挂断电话 B.打碎;结束 C.放弃 D. 举起;阻拦。根据题意,对不起我不得不挂断电话了。该上课了。——好吧,稍后我打给你。故选A。