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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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 |