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went to the u.s.in 1956 and have lived there()

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went to the u.s.in 1956 and have lived there()
A.ever since B.since C.after D.after that
但为什么呢,它在句子里做什么成分,为什么别的不行,望详解
went to the u.s.in 1956 and have lived there()
A 从那时到现在
做状语,此时since为副词
since单独出现,一般认为是介词或连词,其后不能为空
(since也可以单独做副词表达和ever since类似的意思,只不过没有ever所表达的“不间断,持续”意,故一般用于否定句,且动词一般是短暂的)
after 介词后不为空
after that 在那之后(的某一点),无持续意