2. 外语
  3. It was in 1969 ______ the American astronaut succeeded in landing on the moon.

It was in 1969 ______ the American astronaut succeeded in landing on the moon.

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问题 It was in 1969 ______ the American astronaut succeeded in landing on the moon.
选项 A、that
B、which
C、in which
D、when
答案A
解析
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