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英语改错1.Last night when Steven and I were having a walk in the

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英语改错
1.Last night when Steven and I were having a walk in the street,we suddenly heard a painful cry for help under a tree nearby.
我看过答案:help后加from,为什么要这样改呢?
2.
from under两个介词连用,是很常见的一种用法,表示方向,“从附近的树底下”
类似于he jumped out from behind the door.他从门后跳出来.
from表示的是求救声是来自于树底下,如果不加from,意思就变了,成为我们在树底下了.