To meet someone unexpectedly is to run __________ him

问题描述:

To meet someone unexpectedly is to run __________ him
after
into
with
against 选哪个

选into
run into 是“碰巧遇到”的意思,符合题意.
run after 追赶
run with与.一起跑步
run against 与.反方向跑