I________ see him when I was walking in the street.A.happen to \x05B.was happening to \x05C.happened to \x05D.happens to 选C,请问为什么?

I________ see him when I was walking in the street.A.happen to \x05B.was happening to \x05C.happened to \x05D.happens to 选C,请问为什么?
I________ see him when I was walking in the street.
A.happen to \x05B.was happening to \x05C.happened to \x05D.happens to
选C,请问为什么?

I________ see him when I was walking in the street.A.happen to \x05B.was happening to \x05C.happened to \x05D.happens to 选C,请问为什么?
happen to do 是偶遇的意思,因为是过去时 所以用happened

happen to 表示碰巧，与was walking 时态一致，用过去时