課本中不會(huì)教你的[A]83　at a time和at one time

83　at a time和at one time

① at a time表示“一次，再次”。

She reviewed three lessons at a time. 她一次復(fù)習(xí)了三課。

He went up the stairs two at a time. 他一次邁兩個(gè)臺(tái)階。

② at one time表示“曾經(jīng)，有一段時(shí)間”，常同過(guò)去時(shí)連用。

At one time I worked in a middle school. 有一段時(shí)間我在一所中學(xué)工作。

Her mother was at one time a nurse. 她母親有一段時(shí)間當(dāng)護(hù)士。