问题补充：
．piano is her main focus，shes also great at guitar．
A. Since
B. Once
C. Unless
D. While
答案：
A. Since
B. Once
C. Unless
(答案→)D. While
解析：考查状语从句的连词。While=though尽管；句意：尽管钢琴是她的主要学习的乐器，她还很精通吉他。
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