Was it in 1969 the American astronauts succeeded landing on the moon?
| A．when; on |
| B．that; on |
| C．when; in |
| D．that; in |
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Was it in 1969 the American astronauts succeeded landing on the moon?
| A．when; on |
| B．that; on |
| C．when; in |
| D．that; in |
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