By the time Einstein was 14 years old, he himself advanced mathematics.
A. has taught
B. taught
C. had taught
D. was teaching
By the time Einstein was 14 years old, he himself advanced mathematics.A. has taughtB. ta
答案:2 悬赏:40 手机版
解决时间 2021-12-23 16:22
- 提问者网友：最美的风景
- 2021-12-23 01:27
最佳答案
- 五星知识达人网友：行雁书
- 2021-12-23 02:47
A. has taughtB. taught (答案→)C. had taughtD. was teaching解析：by the time 引导时间状语从句，主句中的动作发生在从句中的动作之前。故用过去完成时。
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- 1楼网友：山君与见山
- 2021-12-23 03:42
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