Such a good opportunity may not e again, so you let it go this time.
A. hadn’t better
B. wouldn’t better
C. would better not
D. had better not
网友回答
A. hadn’t better
B. wouldn’t better
C. would better not
(答案→)D. had better not
解析：考察虚拟语气. had better相当与一个助动词,它的后面要跟动词原形它的否定式是在它后面加not:没有would better这种说法.句意:这样的好机会不会再出现了,因此你不能让它溜走.故选D.