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How tired the school pupils have got ___ walking so long a t

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How tired the school pupils have got ___ walking so long a time.
A.at B.from C.through D.over
为什么选B?
How tired the school pupils have got ___ walking so long a t
选B,学生因为长时间的行走,感到非常疲惫了.
from 此处的用法是表示理由,原因或动机,比如 she felt sick from tiredness.她因疲劳而感到不舒服.
而句中的got 是和have 相连构成的have got.形式上是完成时,实际上是和一般现在时的have 意思相同,其实该句就是how tired the school pupils have got from walking so long a time.
再给你一个例子 He has got(=has)a slight headache.他有点头疼.