Shirley( )a book about China last year but I don't konw whet

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Shirley( )a book about China last year but I don't konw whether she has finished it.
A.has written
B.wrote
C.had written
D.was writing
要有理由.而且最好能够说明它考的是哪方面的知识点.

D .was writing
时间是last year,用过去时,排除A,C
而根据题意“I don’t know whether she has finished it(我不知道她是否已经写完)”,所以用进行时was writing,表示动作的持续,符合题意.而wrote表示“（过去）已写完”,与题意不符合.
其所考的知识点是时态：过去式,完成时态,过去进行时的区别

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