Was it in 1969 ______ the American astronaut succeeded ______ landing on the moon?A.when;

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Was it in 1969 ______ the American astronaut succeeded ______ landing on the moon?

A.when; on

B.that; on

C.which; in

D.that; in

热搜:关于氨基酸代谢错误的论述是_________。