.Many of them turned a deaf ear to his advice, they knew it to be valuable. A. as ifB. no

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A. as if
B. now that
(答案→)C. even though
D. so that
解析：as if意为“好像”“似乎”，now that意为“既然”，even though意为“尽管”“虽然”，so that意为“为了”。比较四个选项，只有选C最合适。