Many of them turned a deaf ear to his advice, they knew it to be valuable.
A. as if
B. even though
C. now that
D. so that
网友回答
A. as if
(答案→)B. even though
C. now that
D. so that
解析：考察连词。As if 似乎，好像 Even though尽管 now that 既然 so that 为了，以致于
句意为，他们中的很多人对他的建议充耳不闻，尽管他们知道他的建议很有价值。