Many of them didn’t follow his advice they knew it to be useful.A. as ifB. even thoughC.

问题补充：

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

答案：

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。