题目内容
The telephone ________ for five minutes before it ________ .
[ ]
A.was ringing, was answered
B.had been ringing, was answered
C.was rung, answered
D.had been rung, was answered
答案:B
练习册系列答案
相关题目
题目内容
The telephone ________ for five minutes before it ________ .
[ ]
A.was ringing, was answered
B.had been ringing, was answered
C.was rung, answered
D.had been rung, was answered