Great changes __ place and many schools ____.A、have taken ;have been opened 为什麼选择A,这句翻译

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Greatchanges__placeandmanyschools____.A、havetaken;havebeenopened为什麼选择A,这句翻译Greatchanges__placeandman

Great changes __ place and many schools ____.A、have taken ;have been opened 为什麼选择A,这句翻译
Great changes __ place and many schools ____.A、have taken ;have been opened 为什麼选择A,这句翻译

Great changes __ place and many schools ____.A、have taken ;have been opened 为什麼选择A,这句翻译
该句式是现在完成时,前后两个空是用and连接的,是并列的,所以时态应该一致.take place是不及物动词短语,不能用被动语态,而open是形容词,变被动语态时前面需加been.说这句话的时候说明改变已经发生了,而且是在当时说的,不是过去的过去,所以只能用现在完成时