问题
选择题
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
题目分析：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。