Question

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

A. Since
B. Once
C. Unless
D. While

Answer 1

答案D
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。