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