Although ______ Spanish,he attended the course.A.he was knowing B.he is knowingC.having a knowledge of D.knows为什么?

Although ______ Spanish,he attended the course.A.he was knowing B.he is knowingC.having a knowledge of D.knows为什么?
Although ______ Spanish,he attended the course.
A.he was knowing B.he is knowing
C.having a knowledge of D.knows
为什么?

Although ______ Spanish,he attended the course.A.he was knowing B.he is knowingC.having a knowledge of D.knows为什么?
如果答案非要是C的话,那我也没什么办法,因为觉得A也没错
C可能就是一个条件状语吧,下面是新概念的原文although开头
although the old Galileo lives on in many popular writings,among historians of science a new and more sophisticated picture has emerged
中国人出的题真是没事找事儿