______hebecameseriousl

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D解析even though(=even if) 从属连词，意为：“即使，即使……也……；”引导让步状语从句。even though引出的是事实，even if引导的含有强烈的假定性。故选D：Even though  he became seriously ill, he still went on working.尽管他病得很严重，但他还是继续工作。