was doing的時(shí)態(tài)是過去進(jìn)行時(shí)。
例句：
The car was doing 90 miles an hour.
汽車以每小時(shí)90英里的速度行駛。
I was honest about what I was doing.
我對(duì)我所做的一切毫不隱瞞。