I didn’t know Headmaster Weng was away for Beijing. I to his office yesterday.
A. mustn’t have gone
B. needn’t have gone
C. wouldn’t have gone
D. couldn’t have gone
网友回答
A. mustn’t have gone
(答案→)B. needn’t have gone
C. wouldn’t have gone
D. couldn’t have gone
解析：考查情态动词的完成式：A．mustn’t have gone 过去不可能做了…B．needn’t have gone过去本不必去而去了， C．wouldn’t have gone过去本不会做而做了，D．couldn’t have gone过去不可能做，句意是：我不知道王校长要了北京。昨天本不必去他办公室的。选B。