题目

I am sorry. I ________ you ________ to me. A . don't know; are speaking B . don't know; were speaking C . didn't know; were speaking D . didn't know; are speaking 答案：C下边给出了四边形ABCD各角度数之比．其中，能判定四边形ABCD是平行四边形的是 [　　] A．1∶2∶3∶4B．2∶2∶3∶3 C．2∶3∶2∶3D．2∶3∶3∶2