The phone had been ringing for three minutes before it .A．answeredB．h
题型：不详难度：来源：
The phone had been ringing for three minutes before it .| A．answered | | B．had answered | | C．was answering | | D．was answered |
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答案
| D |
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。 |
举一反三
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