By the time he was twelve he a chemistry lab of his own.
A. built
B. has built
C. had built
D. was building
By the time he was twelve he a chemistry lab of his own.A. builtB. has builtC. had builtD
答案:2 悬赏:80 手机版
解决时间 2021-12-19 13:27
- 提问者网友：贪了杯
- 2021-12-18 16:36
最佳答案
- 五星知识达人网友：逐風
- 2021-12-18 17:23
A. builtB. has built(答案→)C. had builtD. was building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。
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- 1楼网友：七十二街
- 2021-12-18 18:41
我明天再问问老师，叫他解释下这个问题
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