communities so small that only one one-room schoolhouse was within walking distance为什么加was?完整句子:communities so small that only one one-room schoolhouse was within walking distance of small children.不加was可以吗?句型和意义

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communities so small that only one one-room schoolhouse was within walking distance为什么加was?完整句子:communities so small that only one one-room schoolhouse was within walking distance of small children.不加was可以吗?句型和意义

communities so small that only one one-room schoolhouse was within walking distance为什么加was?完整句子:communities so small that only one one-room schoolhouse was within walking distance of small children.不加was可以吗?句型和意义
communities so small that only one one-room schoolhouse was within walking distance为什么加was?
完整句子:communities so small that only one one-room schoolhouse was within walking distance of small children.
不加was可以吗?句型和意义会有什么不同?

communities so small that only one one-room schoolhouse was within walking distance为什么加was?完整句子:communities so small that only one one-room schoolhouse was within walking distance of small children.不加was可以吗?句型和意义
so……that……引出结果状语从句,既然是从句,那么句子结构就要完整,不加was从句就少了be动词,后面的within walking distance做be后面的表语.