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    精英家教网 > 高中英语 > 题目详情
     By the time he was twelve he ______ a chemistry lab of his own.
    A．builtB．has builtC．had builtD．was building
    C
    有by the time 引导的短语或从句，主句应该是完成时态，至于是什么完成时态，就看by短语或从句中的时态了。
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