when human beings can lands on Mars还是when can human beings lands on Mars

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when human beings can lands on Mars还是when can human beings lands on Mars
when human beings can lands on Mars还是when can human beings lands on Mars

when human beings can lands on Mars还是when can human beings lands on Mars
这要看情况,如果是疑问句则是:
when human beings can lands on Mars
如果是做从句就是第二种

第二种,是对的

疑问句:When can human beings land on Mars?
注意,can后面的动词要用原形,land