Mr Smith a book about China last year but I don’t know whether he has finished it.A. has

问题补充：

Mr Smith a book about China last year but I don’t know whether he 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：考查时态。句意：去年史密斯先生一直在写一本关于中国的书，但是我不知道他是否已经完成了。结合语境可知前文描述的是在过去一直在进行的动作，故用过去进行时态，选D。