By the time he was twelve he ______ a chemistry lab of his own.A．builtB．has bui
题型：不详难度：来源：
By the time he was twelve he ______ a chemistry lab of his own.| A．built | B．has built | C．had built | D．was building |
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答案
| C |
解析
| 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。 |
举一反三
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