wasn't until
was invented by
By the time
3.Tea was brought to the western world in 1610.（改为同义句）
Tea ___wasn't_____ brought to the western world ___before/until_____1610.
4.Who invented tea?（改为被动语态）
Who ___was____ tea __invented_____ __by_____?
5.When I got up, my father had already left.（改为同义句）
___By___ _the___ __time__I got up,my father had already left
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