BeforeherfirstHarryPottercameoutin1997，J.K.Rowling

問題詳情：

Before her first HarryPotter came out in 1997，ing ________ English for a living in Portugal.

A．is teaching  B．had taught

C．has taught  D．would teach

【回答】

B

知識點：過去完成時及其被動式

題型：選擇題