My friend__________(写)a book about China last year,but I don

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My friend__________(写)a book about China last year,but I don't know whether she has finished it.
用write来完成上述空,要讲原因啊!为什么不能用wrote!或者为什么不能用started to write!

这里要用 had been writing 即为现在完成进行时但是这里是去年那么就用had 一般我们是用has/have been doing ,即表示一个动作从过去开始发生,而且带有延续性,可能到现在仍在进行.此处你用worte的话,那么就表示这本书已经完成了,与last year这个过去时间符合,但是后面说了我不知道她是否已经写完了,所以后面的就不符合了.start一般只表示一个短暂的动作,一般不具有延续性,故而不用.
再问：但答案是was writting
再答：哦，这样啊，我看下啊，那么应该是后面的last year的原因，如果去掉这个时间点才能用has been doing。我忘了现在完成进行时不能和时间点连用，抱歉，was doing的话就是表示过去一直进行的动作，与后面的语境也很符合、。

My friend__________(写)a book about China last year,but I don Shirley ____ a book about China last year,but I don’t know w Mr Smith_____(write)a book about China last year but I don"t 7.Shirley ______ a book about China last year but I don’t kn Shirley( )a book about China last year but I don't konw whet Shirley _______ a book about china last year but I don’t kno Shirley ______ a book about China last year but I don’t know 1My sister _______ a book about France last year but I don't 1.Shirley__a book about China last year but I don't know whe he__a book about china last year ,but i don't know if he___i shirley __a book about about china last yuae but i don"t kno she -------a book about China last year,but l do not know wh