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

问题补充：

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

A. Since

B. Once

C. Unless

D. While

答案：

A. Since

B. Once

C. Unless

(答案→)D. While

解析：句意为：虽然排球是她的主要项目，但她还擅长篮球。while“虽然，尽管”。Since“自从”once“一旦”unless“除非”均不合题意。