Question

He ________ a book about America last year but I don’t know whether he has finished it．

[　　]

A．has written

B．was writing

C．had written

D．wrote

Answer 1

答案：B
提示：

根据后半句“I don’t know whether he has finished it．”(我不知他是否已完成)可知，不能用过去时或完成时，而只能用过去进行时，表示“写书”这个动作在过去一年里一直在进行。