assist sb in doing sth中in可否省略?
assist sb in doing sth中in可否省略?
assist sb.to do sth.和assist sb.in doing sth.
join sb in doing Sth 中的in可省略吗:-).
Help sb in doing sth中的in可以省略吗?
sb in doing sth
Succeed in doing 结构中 in 可否省略?
succeed in doing sth 中 in可以省略吗?
help sb in doing sth &help sb to do sth
keep sb.from doing sth.和stop sb.from doing sth.中哪个from可以省略
sb spend some time in doing sth
join sb in doing sth 是什么意思?
sb.spend time(in)doing sth.