BeforeherfirstHarryPottercameoutin1997，J.K.Rowling

问题详情：

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

知识点：过去完成时及其被动式

题型：选择题