The phone had been ringing for three minutes before it            .
A．a(chǎn)nswered
B．had answered
C．was answering
D．was answered
D
由主句的had been ringing判斷，從句用過(guò)去時(shí)態(tài)，我們看出answer與it是被動(dòng)關(guān)系。
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