____ from the moon, our earth with water ____ seventy percent of its surface, appears as a blue ball.

A. Seen; covered     B. Seeing; covering     C. Seen; covering     D. Seeing; covered

____ from the moon, our earth with water ____ seventy percent of its surface, appears as a blue ball.

A. Seen; covered     B. Seeing; covering     C. Seen; covering     D. Seeing; covered

________ from the moon, our earth with water ________ seventy percent of its surface, appears as a“blue ball”.

[　　]

______ from the moon，our earth with water______ seventy percent of its surface，appears as a blue ball．

A．Seen; covered                                            B．Seen; covering

C．Seeing；covering                                       D．To see； to cover