Question

【题目】The telephone has been ringing for two minutes before it

A.had answeredB.was answeredC.answeredD.was answering

Answer 1

【答案】B

【解析】

句意：电话响了两分钟才有人接。

A. had answered已经接了，过去完成时，B. was answered被接，被动语态，C. answered接，过去时，D. was answering正在接，过去进行时。根据has been ringing可知，answer发生在两分钟以前，本题应该用过去时，主语it和answer是被动关系，故选B。