have sth doing的用法归纳分点回答

　　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。

　　Biological systems have been doing this for billions of years

　　生物系统亿万年来一直都是这样。

　　What have you been doing this week?

　　你这个星期都在做些什么？

　　What have you been doing with yourselves?

　　你们这一向是怎么过的？

　　I'd never have dreamt of doing such a thing.

　　我做梦也没想过干这样的事。

　　Salesmen of unofficial souvenirs have also been doing a roaring trade.

　　出售非官方纪念品的推销员的生意也很红火。