i won t be able to attend the lecture because___ i a report in my police then

问题描述:

i won t be able to attend the lecture because___ i a report in my police then
A.will have written
B.was writing
C.have been writing
D.will be writing

I won't be able to attend the lecture because I will be writing a report in my police then.
我不能去出席讲座了,因为那时我将会在我的办公室内完成一篇报道
将来进行时,因为有then,选择D