问题
选择题
The phone had been ringing for three minutes before it .
A．answered
B．had answered
C．was answering
D．was answered
答案
答案：D
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。
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The phone had been ringing for three minutes before it .
A．answered
B．had answered
C．was answering
D．was answered
答案：D
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。