______as 2500 B.C, the Egyptians used mirrors made of highly polished metal.

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问题 ______as 2500 B.C, the Egyptians used mirrors made of highly polished metal.

选项 A、In early
B、As early
C、Early
D、Was as early

答案B

解析 句意:早在公元前2500年,人们使用高抛光的金属制造的镜子。as early as早在……时候,很久以前。
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