Mr Smith_____(write)a book about China last year but I don"t know whether he has finished

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Mr Smith_____(write)a book about China last year but I don"t know whether he has finished
Mr Smith_____(write)a book about China last year but I don"t know whether he has finished

Mr Smith_____(write)a book about China last year but I don"t know whether he has finished
was writing a book 表示动作在进行中,有可能持续,
用wrote表示:她去年写了本书,显然已经完成了.

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

应该是was writing
"last year" 暗示 过去式
“whether he has finished” 暗示 采用非完成时
如果是"wrote"表示已写完
所以用"was writing"