I really don't know what ----------him yesterday.( run into)

I really don't know what ----------him yesterday.( run into)
I really don't know what ----------him yesterday.
( run into)

I really don't know what ----------him yesterday.( run into)
was run into
run into 偶然遇见
例句:
I ran into Bob yesterday on main street.
昨天我在大街上偶然遇到了鲍勃.
He has run into trouble in his job.
他的工作遇到了麻烦
what是事,事作主语,被遇见所以要用被动语态,过去时

ran into

ran into
因为时间是昨天，用一般过去时。
翻译：我真的不知道昨天为什么遇见了他。