He flew a doctor to a Welsh village.__he has flown to many unusual places.A from then Bby then CDHe 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
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He flew a doctor to a Welsh village.__he has flown to many unusual places.A from then Bby then CDHe 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
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
He flew a doctor to a Welsh village.__he has flown to many unusual places.A from then Bby then CDHe 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.)
c
by后边只能跟名词 代词 不能跟then等这种副词