By the time he was twelve he ______ a chemistry lab of his own.
A．built
B．has built
C．had built
D．was building
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
根据n多题专家分析，试题“By the time he was twelve he ______ a chemistry lab of his own.A．builtB．has builtC．had builtD．was building…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
◎ 相似题
与“By the time he was twelve he ______ a chemistry lab of his own.A．builtB．has builtC．had builtD．was building”考查相似的试题有：
