一道关于时间的语法题。

来源：百度知道 编辑：UC知道 时间：2024/06/28 22:54:16
1.He flew a doctor to a Welsh village._____he has flown to many unusual places.
A. From then B.By then C. By that time D. Since that time

请不要只写一个选项 ，请高手详细解释，谢谢~！

D. Since that time

he flew a doctor to a welsh village 已经解释了说他载过一个医生去过welsh village。 所以自从那次开始， 他就飞过很多不寻常的地方。

提示是从 flew 和 has flown 得来的。

D 在那之前
from then 从那是起
by then 到那时
by that time 到那时

D. since 后面一定接完成时态

B

c