单选题
______ for your laziness, you could have finished the assignment by now.
A、
Had it not been
B、
Weren't it
C、
It were not
D、
Had not it been
【正确答案】
A
【答案解析】
[注释] 题中逗号前为省略了if并部分倒装的虚拟条件句，表示与过去事实相反的假设。此处主句用could+完成时，条件句应为过去完成时态。
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