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题目
题型:不详难度:来源:
By the time he was ten,Edison______experiments in chemistry.
A.had already done    B.already had done
C.was already doing    D.already did

答案

解析
by+过去时间,谓语用过去完成时态。
核心考点
试题【By the time he was ten,Edison______experiments in chemistry.A.had already done  】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
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