问题
单项选择题
______you were busy, I wouldn't have bothered you with my questions.
A．If I realized
B．I realized that
C．Had I realized
D．As I realized
答案
参考答案：C
解析：此句为与过去事实相反的虚拟句，条件上句用的是if I had realized you were busy的倒装形式。