题文
Stephen Hawking believes that the earth is unlikely to be the only planet __________ life has developed gradually.
| A．that |
| B．where |
| C．which |
| D．whose |
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Stephen Hawking believes that the earth is unlikely to be the only planet __________ life has developed gradually.
| A．that |
| B．where |
| C．which |
| D．whose |
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