鸡血石怎么鉴别:·20.____ we really cared for most of all was science.

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a.That
b.Which
c.What
d.how
选什么,怎么分析的?
与这句有什么区别吗?
___ there is life on another planet is almost impossible 用That

选C what
这是一个主语从句，整个（What we really careed for most of all）作为was的主语，science是宾语，而what又作we care for的宾语，
意思是，我们首要认真关注的，是科学。
你列的另外那个句子That there is life on another planet is almost impossible，也是一个很典型的主语从句，整个There is life on another planet作为整个句子的主语，而因为主语中又不缺主谓宾（there is life就是主谓宾，而on another planet是作为介词短语解释），所以选that来引出这个长长的主语，就ok了^_^句子意思是：另外一个星球上也有生命，这几乎是不可能的。

平常做这些题的时候，划一下句子成分，用括号把长长的主语括起来，再分析里面是否主谓宾都齐全，如果齐全，就用that引导出主语跟后面连接，如果不齐全，就分析到底缺什么，把语序还原一下，象那句，what we care for，还原就是we care for what,what显然是宾语，指我们所要关心的“东西”。

c.What.

这道题考察先行词，由于前面没有先行词it, 所以应该选C. what

c整个句子为主语从句.

c.What

C what

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