问题
选择题
The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered
答案
答案：D
这里动词answer是及物动词，所以要用被动语态。
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The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered
答案：D
这里动词answer是及物动词，所以要用被动语态。