2. 外语
  3. The telephone had been ringing for five minutes before it______.

The telephone had been ringing for five minutes before it______.

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问题 The telephone had been ringing for five minutes before it______.
选项 A、answered
B、had been answered
C、was answering
D、was answered
答案D
解析 本题考查动词的时态。分析句子结构可知，本句是一个before引导的时间状语从句，主句部分谓语动词为过去完成进行时，根据句意，before连接的从句部分谓语动词应用一般过去时。鉴于telephone与answer之间为被动关系，因此此处用一般过去时的被动语态(was／were done)，D为正确选项。
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