Shirley a book about Tibet last year but I don’t know whether she has finished it.A. has

问题补充：

Shirley a book about Tibet last year, but I don’t know whether she has finished it.

A. has written

B. wrote

C. had written

D. was writing

答案：

A. has written

B. wrote

C. had written

(答案→)D. was writing

解析：根据时间状语last year，可知要用过去时态，but I don’t know whether she has finished it.但是我不知道她是否写完了，可知是去年正在写，而不是写了一本书。所以选D。