we felt sorry__the old man,but we didn't know__to help him.we felt sorry__the old man,but we didn't know__to help himA、about,how B、about,what C、for,how D、for,what
问题描述：
we felt sorry__the old man,but we didn't know__to help him.
we felt sorry__the old man,but we didn't know__to help him
A、about,how B、about,what
C、for,how D、for,what
答