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  3. ______ one time, Manchester was the home of the most productive cotton mills in the world.

______ one time, Manchester was the home of the most productive cotton mills in the world.

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问题 ______ one time, Manchester was the home of the most productive cotton mills in the world.
选项 A、On
B、By
C、At
D、Of
答案C
解析 本题测试习惯用法。at one time为固定介词短语，意思为“从前有个时期”或“曾经”，符合句意。故C正确。
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