题文
______from space, the earth, with water _____seventy percent of its surface looks like a blue ball.
| A．Seen; covered | B．Seen; covering | C．Seeing; covered | D．Seeing; covering |
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______from space, the earth, with water _____seventy percent of its surface looks like a blue ball.
| A．Seen; covered | B．Seen; covering | C．Seeing; covered | D．Seeing; covering |
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