Question

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

A．Since

B．Once

C．Unless

D．While

Answer 1

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。