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They say that they were required to study medicine for a lon

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They say that they were required to study medicine for a long time为什么不是has required
不是for加一段时间吗
They say that they were required to study medicine for a lon
如果是have required,便是主动式,可是这是个require sb to do sth 的句型,那sb(人)呢?
可见,只有用被动式
require sb to do sth 要求某人做某事
be required to do sth 被要求做某事
were required 是一般过去时,一般过去时也能和for-时间段的状语连用的呀.
比如:
He stayed in Engliand for half a month last year.
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