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

问题补充：

Many of them turned a deaf ear to his advice, they knew it to be valuable.

A. as if

B. now that

C. even though

D. so that

答案：

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。