you are always optimistic and self-confident, I can't wait to make friends with you.A. Tho

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A. Though
(答案→)B. Since
C. While
D. So
解析：考查连词。句义：因为你总是乐观自信，所以我迫不及待地和你交朋友。Though，尽管，虽然，since因为由于，while当。。。的时候，尽管，so所以。所以B正确。