When Mr.Wang return ___ China from America,he worked in Beijing as a teacher.(填介词)

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When Mr.Wang return ___ China from America,he worked in Beijing as a teacher.(填介词)

When Mr.Wang return ___ China from America,he worked in Beijing as a teacher.(填介词)
When Mr.Wang return ___ China from America,he worked in Beijing as a teacher.(填介词)

When Mr.Wang return ___ China from America,he worked in Beijing as a teacher.(填介词)
to
return 介词总是 from/to
Mr.Wang -- 单数,叙述的事情是过去,后面的动词 “return” 要有变化.题目里怎么不变?