The astronauts have _____ to the space station twice

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• The astronauts _____(go) to the space station .They will be back next week.
• The astronauts have _____ to the space station twiceA.gone B.been C.went D.be 说明原因
• The space shuttle has _____the space station.It brought back two astronauts A been B gone C been toDgone to
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