Many of them turned a deaf ear to his advice they knew it to be valuable.A. as ifB. now

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：这题考查连词的用法：as if好像，now that既然， even though即使， so that为了，句意是：很多人对他的建议充耳不闻，即使他们知道这是有价值的。选C。