The baby is the only person that ___(survive) the air crash.答案填的是has survived.那填survived过去时不对吗,为什么要填完成时呢.It can _____(believe)that there is no life on Mars.为什么填be believed

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The baby is the only person that ___(survive) the air crash.答案填的是has survived.那填survived过去时不对吗,为什么要填完成时呢.It can _____(believe)that there is no life on Mars.为什么填be believed
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The baby is the only person that ___(survive) the air crash.答案填的是has survived.那填survived过去时不对吗,为什么要填完成时呢.It can _____(believe)that there is no life on Mars.为什么填be believed
The baby is the only person that ___(survive) the air crash.
答案填的是has survived.那填survived过去时不对吗,为什么要填完成时呢.
It can _____(believe)that there is no life on Mars.
为什么填be believed

The baby is the only person that ___(survive) the air crash.答案填的是has survived.那填survived过去时不对吗,为什么要填完成时呢.It can _____(believe)that there is no life on Mars.为什么填be believed
1.现在完成时表示的发生的事情对现在造成的影响和结果.正因为孩子幸免于飞机失事,所以他才成为了the only person,所以得用 has survied.而过去时强调的是过去发生完了的事情,只是简单陈述过去的一件事情,和现在无什么联系.
2.It 指代的是that后面的那句话 there is no life on Mars.（火星上没有生命）
那么,火星上没有生命的这件事情是可以被相信的,所以得用被动语态,又因为情态动词can 后面接动词原形,所以就用be+believed

完成时表示过去发生的事情对现在造成的影响或结果等。所以这里用完成时。2it is believed...固定搭配

因为前面主句的谓语是is 现在时，所以从句要用现在完成时。
believe的主语应该是人，而这里，主语是it所以要用被动形式。

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