______, he never seems able to do the work satisfactorily.
【正确答案】 D
【答案解析】分析句子结构并结合选项可知,逗号前面是让步状语从句,应用no matter how引导,相当于however,意为“不管怎样,无论如何”,其后应接形容词,且从句应用陈述语序。故选D。