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 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 引導的短語或從句，主句應該是完成時態(tài)，至于是什么完成時態(tài)，就看by短語或從句中的時態(tài)了。
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