Mrs. Green was sure that ______. People didn’t have to .move from one place to another after ______.

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问题 Mrs. Green was sure that ______.
People didn’t have to .move from one place to another after ______.

选项 A、machines came along
B、factories were built
C、they learned to hunt animals

答案B

解析 有了工厂,人们就不用搬来搬去了。
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