I called you up last night but I couldn’t .A. get throughB. ring backC. ring offD. hang o

问题补充：

I called you up last night but I couldn’t .

A. get through

B. ring back

C. ring off

D. hang on

答案：

(答案→)A. get through

B. ring back

C. ring off

D. hang on

解析：考查动词短语：A. get through接通，B. ring back回电。C. ring off挂断，D. hang on悬挂，句意：昨天晚上我给你打电话，但是打不通。选A。