drop in和drop by的区别
问题描述：
drop in和drop by的区别
答
drop in的例子：Drop in to see us any time.随便什么时候顺便来看看我们.I' d like to drop in and see you sometime next week.我想在下周什么时候顺便来看看你.It's improper to drop in on him so casually.这样...