He flew a doctor to a Welsh village.__he has flown to many unusual places.A from then Bby then CD

题目

He flew a doctor to a Welsh village.__he has flown to many unusual places.A from then Bby then CD
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 Dsince that time

答案

答案应该是 D.
since that time = 自从那一次起
He flew a doctor to a Welsh village
(曾经做过的事.）
...he has flown to many unusual places.
(一直还做的事.）

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