By the time he was twelve he ______ a chemistry lab of his

By the time he was twelve he ______ a chemistry lab of his own.
A.built B.has built C.had built D.was building
fedder 1年前 已收到1个回答 举报

yaoyao0424 幼苗

共回答了16个问题采纳率:93.8% 举报

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。

1年前

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