— Sorry I have to now. It’s time for class. — OK I’ll call back later. A. hang upB. han

问题补充：

— Sorry, I have to now. It’s time for class.

— OK, I’ll call back later.

A. hang up

B. hang on

C. hold on

D. hold up

答案：

(答案→)A. hang up

B. hang on

C. hold on

D. hold up

解析： 动词词义辨析题。A. hang up“挂断电话”B. hang on“等待“”C. hold on“不挂断”D. hold up“举起”根据句意“不得不挂断电话该上课了”所以选A。