问题补充：
—My sister finished school three years ago.
—Whatthese years?
A. did she do
B. has she been doing
C. is she doing
D. does she do
答案：
A. did she do
(答案→)B. has she been doing
C. is she doing
D. does she do
解析：“这些年她都在做什么?”要用现在完成进行时来表示。
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