The boy ____won the first prize is called Roy.

  A. when   B. whom    C. who    D. which

The boy________won the first prize is called Roy.

A.when             B.whom         C.who                D.which

The boy ________ won the first prize is called Roy.

A. when

B. whom

C. who

D. which

The boy _____ won the first prize is called Roy．

　　A．when　　B．whom　　C．who　　D．which