volleyball is her main focus she’s also great at basketball.A. SinceB. OnceC. WhileD. Unl

问题补充：

volleyball is her main focus, she’s also great at basketball.

A. Since

B. Once

C. While

D. Unless

答案：

A. Since

B. Once

(答案→)C. While

D. Unless

解析：句意：虽然排球是她的主攻方向，但是她篮球也很擅长。A. Since既然、因为；B. Once一旦； C. While虽然、尽管；D. Unless除非。根据语境，选C。

考点: 考查状语从句的连接词的用法。