When and where to build the new school ( ) A:is not decided

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When and where to build the new school ( ) A:is not decided B has not been decided答案和解释区别
为什么选择A 而不选择选b

B,现在完成时,表目前为止还没有确定
A 一般时表,一般情况,长期如此,现在如此,将来也如此,未确定.When and where to build the new school 这个问题一段时间后,应该可以确定吧,
应选B
再问：不正确是A
再答：那说明这个问题很难确定吧，只讲目前现状，不强调对当前形势的影响

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