请指出下列各句话中的“影”所遵从的物理规律，用以下物理规律前的字母填入相应的横线内：

（1）形影不离______；（2）湖光倒影______；（3）毕业合影______；（4）立竿见影______．

a．光的直线传播规律；b．光的反射规律；c．凸透镜成像规律．

You     here half an hour earlier. It is a pity you missed the famous star. [ ]

A. must have come          

B. might have come        

C. Should have come        

D. could have come