--Is your father a teacher of English in the NO.1 Middle School?---No!But he ___English there for ten years.A.has taught B.has been teaching C.taught D.had taught 答案是C为什么不选B?
问题描述：
--Is your father a teacher of English in the NO.1 Middle School?
---No!But he ___English there for ten years.
A.has taught B.has been teaching C.taught D.had taught 答案是C
为什么不选B?
答
因为,从No,可见,他现在已不是一中的老师了,换句话说,在那从教10年是“过去”,而非现在,不包括现在在内
如果选B（现在完成进行时）,就意味着现在还在那任教,这与前面的答语“No,”就自相矛盾了
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