Many of the students turned a deaf ear to his advice they knew it to be valuable．A. as if

问题补充：

Many of the students 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

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