The doorbell had been ringing for several minutes before it ______. A answered
题型：不详难度：来源：
The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered |
答案
| D |
解析
| 这里动词answer是及物动词，所以要用被动语态。 |
举一反三
| The notice ______ “No smoking”. A is told B reads C tells D is read |
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--- What ______ when I phoned you?
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