用括号内所给的单词的正确形式填空 Many astronauts ___already____(visit)the space station.

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用括号内所给的单词的正确形式填空 Many astronauts ___already____(visit)the space station.
用括号内所给的单词的正确形式填空 Many astronauts ___already____(visit)the space station.

用括号内所给的单词的正确形式填空 Many astronauts ___already____(visit)the space station.
have ,visited

had visited

have visited

have ,visited