they need help ( ) their school trip a.in b.out c.on d.for_英语解答

they need help ( ) their school trip a.in b.out c.on d.for

人气：205 ℃　时间：2020-05-09 02:18:13

解答

d.for
need help for sth.
因为某事需要帮助.
need help for sth.做某事需要帮助;