Was it in 1996 _____ the American astronaut succeeded _____ landing on the moon?
| A．that; in | B．when; on | C．what; on | D．when; in |
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Was it in 1996 _____ the American astronaut succeeded _____ landing on the moon?
| A．that; in | B．when; on | C．what; on | D．when; in |
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