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_______ is known to everybody that the moon travels round the earth once every month.

A. It        B. As       C. That         D. What

_____ is known to everybody that the moon travels round the earth.

_____ is known to everybody that the moon travels round the earth.

A．It                B．As               C．When            D．Where

        is known to everybody that the moon travels round the earth once every month.

        A．It                                B．As                              C．That                          D．Which

_______ is known to everybody that the moon travels round the earth once every month.

A. It　　　　　　　　　　　 B. As

C. That　　　　　　　　　　 D. What