From space, the earth looks blue. This is _______ about seventy-one percent of its surface is covered by water.
| A．why |
| B．how |
| C．because |
| D．whether |
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From space, the earth looks blue. This is _______ about seventy-one percent of its surface is covered by water.
| A．why |
| B．how |
| C．because |
| D．whether |
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