Many of them didn’t follow his advice, they knew it to be useful.
A. as if
B. even though
C. so that
D. because of
网友回答
A. as if
(答案→)B. even though
C. so that
D. because of
解析：词义辨析。A似乎；B即使；C以至于；D因为（介词短语）；句意：他们中的很多人都没有采纳他的建议，即使他们知道这些建议都是有用的。根据句意说明B正确。