The phone had been ringing for three minutes before it.A. answeredB. had answeredC. was an

发布时间：2020-08-17 15:11:17

The phone had been ringing for three minutes before it    .
A. answered
B. had answered
C. was answering
D. was answered

网友回答

A. answered
B. had answered
C. was answering
(答案→)D. was answered
解析：由主句的had been ringing判断，从句用过去时态，我们看出answer与it是被动关系。
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