题目

You can help a friend _____his or her studies in on with of
You can help a friend _____his or her studies
in ,on ,with ,of
According to studies,people feel good_____they volunteer their time to do many meaningful things for other people
what ,when ,where ,how
1选with,2选when .要原因 .谢

提问时间：2020-12-04

答案

help sb with sth,帮助某人的某件事
第2个when.意为当什么什么的的时候,时间副词,后面是时间,