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

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

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

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

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

________ is known to everybody，the moon travels around the earth once every month.

A．It? B．As

C．That? D．What

______ is known to everybody，the moon travels around the earth once every month.

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

_____ is known to everybody, the moon travels around the earth once every month.

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

_____is known to everybody, the moon travels around the earth once every month.

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