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?

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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 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 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 time.A.at B.from C.through D.over为什么选B?
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.

get through
v.
到达, 做完, 通过, 度过, 打通
get over
v.
爬过, 克服, 熬过, 恢复, 原谅
get at
v.
到达, 够到, 了解, 意味着指责, 含沙影射地攻击
Get from 没有
这里说明时间段,很明显选B

学生们由于长时间行走,很累了.
get tired 是疲倦, 为什么而疲倦? from walking so long a time. 由于长时间行走.

B