Mnay of them turned a deaf ear to his advice,_____ they knew it to be valuable.
问题描述：
Mnay of them turned a deaf ear to his advice,_____ they knew it to be valuable.
A as B if C when D where
答
选择B
这里if表示即使的意思
翻译：他们中的很多总是对他的建议置若罔闻,即使他们知道这些建议是很宝贵的!
turn a deaf ear to 置若罔闻,不理不睬