摘要：It was in 1969 the American astronaut succeeded in landing on the moon. A. that B.which C.in which D.when
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It was in 1969 __________ the American astronaut succeeded in landing on the moon.
A. that B. which C. when D. in which
It was in 1969 ___ the American astronaut succeeded in landing on the moon.
A that B which C in which D when