Mr. Smith graduated from college at the age of 23, and he has been working as a teacher i

发布时间：2020-08-16 13:43:47


Mr. Smith graduated from college at the age of 23, and      he has been working as a teacher in a middle school.
A. after that
B. from then on
C. from then
D. since then

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A. after that
B. from then on
(答案→)C. from then
D. since then
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