Layura started his voluntary work in 2001,——she has helped scores of dropout children back to schoolA when B since then C ...
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回复(1) 2012-04-06 21:56 来自版块 - 
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teacherzdl选C 非限制性定语从句,而且since后面跟时间,后面的句子中用现在完成时(2012-04-06 21:57)

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