a long line of people waiting to get in..如何分析waiting自己会做.但是教别人就不知道怎么说了,这里wait 有其他时态的形式,waited wait being wait如何说明要用waiting

问题描述:

a long line of people waiting to get in..如何分析waiting
自己会做.但是教别人就不知道怎么说了,这里wait 有其他时态的形式,waited wait being wait如何说明要用waiting