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
B　

試題分析：考查情態(tài)動詞的完成式：A．mustn’t have gone 過去不可能做了…B．needn’t have gone過去本不必去而去了， C．wouldn’t have gone過去本不會做而做了，D．couldn’t have gone過去不可能做，句意是：我不知道王校長要了北京。昨天本不必去他辦公室的。選B。
點評：情態(tài)動詞的用法，要掌握每個情態(tài)動詞的基本用法，其它的結(jié)構(gòu)都是由其基本用法變化而來。情態(tài)動詞+have done，一是表示推測，二是表示虛擬，要記牢。
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