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【正】 O.引言: 请看下列两对句子: A He has lived in shanghai since 1948. A′He has been living in Shanghai since 1948. 以及B He has done the work since 1948. B′He has been doing the work since 1948. 按照教统的语法解释,since引出的时间状语要求与完成时态的句子连用,所以上述A、B两组都认为是“正确”句。但是“语感”告诉我们,上例中的B句是“