问题补充:
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
答案:
A. after that
B. from then on
(答案→)C. from then
D. since then
解析:可联系答.案.网客服索取。
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