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Within about 30 years from now,the first people from Earth--

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Within about 30 years from now,the first people from Earth--------on Mars.
A.will land
B.have landed
C.will have landed
选哪个?为什么?A为什么不行?
Within about 30 years from now,the first people from Earth--
在未来的30年之内,地球上的人类将会登陆火星.
选C
A不可以因为本句表示未来人类已经登陆了,表示的是一种延续的动作（已经登陆的这种状态）,而A表示登陆过.在此前半句有提示“within about 30 years”表示在未来三十年之内,这是一段时间,所以说明这是一个延续的状态.所以选c
Within about 30 years from now,the first people from Earth-- How many people will there be on the earth 100 years from?同义 100 years from now? 英语作文Write about your life 20 years from now . first entry within 90 days from the date of issue的意思 .At this time,people also remember the first travelers from people also remember the first travelvers from england __cam I think the future in 30 years is different from now对不对 The celebration and love come from within People have learn more about the earth in the last few years Happiness can come from the outside and from within the show is about stories .people from all over