________ volleyball is her main focus, she's also great at basketball.
A. Since
B. Once
C. Unless
D. While
________ volleyball is her main focus, she's also great at basketball.
A. Since
B. Once
C. Unless
D. While
D解析:since“自……以来”;once“一旦”;unless“除非”;while“虽然,尽管”。句意:“虽然排球是她的专项,她篮球打得也不错。”故选D项。