have since been 和 have been since
have since been 和 have been since
英语人气:589 ℃时间:2019-11-16 18:30:29
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应该是二者的词性不同吧:have since been 中的since是副词,修饰have been.但是have been since中的since是个连词,它后面必须要接点什么东西.eg:the building has since been under constuction .the building has ...
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