by to do sth=by doing sth吗
by to do sth=by doing sth吗
by doing sth.可以省略by吗?
what do you mean by doing sth?
V+by+doing sth
by doing sth造句
用 do sth by doing sth和do sth by mistake 造句
用do sth.by doing sth造句 math physics chemist
begin doing sth.=start to do sth.=start doing sth.吗?
use sth to do sth =use sth for doing
oblige sb to do sth by force
happen to do sth与do sth by accident一样吗
造10个英语句子,关于 do sth by doing