问题
选择题
It was in 1969 ______ two Americans went to the moon by spaceship.[ ]
A. when
B. that
C. at that time
D. just then
答案
答案：B
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It was in 1969 ______ two Americans went to the moon by spaceship.[ ]
A. when
B. that
C. at that time
D. just then
答案：B