for the fact that you were lazy, you could have finished the assignment by now.
A. It were not
B. Weren’t it
C. Had it not been
D. Had not been
网友回答
A. It were not
B. Weren’t it
(答案→)C. Had it not been
D. Had not been
解析：考查虚拟语气。根据语境可知为对过去事实相反的虚拟语气，故从句用had + v过去分词，Had it not been = if it had not been，选C。