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10、______ 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

10、B

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______ 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

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