havebeendoing是什么时态用法

问题描述

精选答案

have been doing是现在完成进行时。例句：The car must have been doing at least 100 miles an hour. 这车速肯定每小时至少100英里。I have been doing some historical research. 我一直在进行史学研究。

相关介绍：

We have been doing it for years.

我们多年来一直在做这个。

Many have been doing so.

许多新兴市场国家也就是这么做的。

We can do what we have been doing.

我们也可以一如既往，旧调重弹。