Many of them turned a deaf ear to his advice they knew it was useful.A. as ifB. now thatC.

问题补充：

Many of them turned a deaf ear to his advice,they knew it was useful.

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：考查连词辨析。A似乎；B既然；C即使；D以至于。句意：很多学生对他的建议充耳不闻，即使他们知道他的建议很有用。根据句意说明C正确。