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：该空表示“即使”，因此应填even though引导让步状语从句。