Many astronauts ___ on the moon since the beginning of the space program., have landed, landed, Tourists _____ on the moon yet., have not landed, didn't land, Space travel _____ since 1961., existed, has existed, _____ to the moon?, Were you, Have you been, When _____ the first astronauts _____ on the moon?, did, land, have, landed, Apollo 11 _____ in 1969., has landed, landed.

AESOP, NS 3, Present Perfect vs. Simple Past

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