【题目】 volleyball is her main focus, she is also great at basketball.
A.Since
B.Once
C.Unless
D.While

【答案】D
【解析】考查让步状语从句。根据主句内容可知，她也擅长打篮球，由此可知排球是她的强项，故选while“尽管”引导让步状语从句。所以答案是D。