Problems relating to people's livelihood(民生)have been the focus of the government, especially ________ Premier Wen Jiabao included them in his government work report last year．A.whenB.ifC.sinceD.until
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C解析考查连词。句中since引导时间状语从句，时态用一般过去时，主句通常用完成时态。难度适中。