_______from the moon, our earth, with water _____about 70 percent of its surface, appears like a blue ball.
| A．Seen; covered | B．Seeing; covering |
| C．Seen; covering | D．Seeing; covered |
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_______from the moon, our earth, with water _____about 70 percent of its surface, appears like a blue ball.
| A．Seen; covered | B．Seeing; covering |
| C．Seen; covering | D．Seeing; covered |
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