volleyball is her main focus she's also great at basketball.(·北京)A. SinceB. OnceC. U

问题补充：

volleyball is her main focus，shes also great at basketball.(·北京)

A. Since

B. Once

C. Unless

D. While

答案：

A. Since

B. Once

C. Unless

(答案→)D. While

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。不少考生不知while有此含义，容易误选其他选项。