题目内容：

I will not be able to finish the work on time ___I am leave for London tomorrow.
A.although
B.unless
C.so
D.as
并说明选择的理由

优质解答

D
我无法完成工作,因为我明天要去伦敦了.
as 》》 表明“因为...” 作用类似because
*不过这句话本身文法有误.I am leave?>> I am leaving...才对