that不能省略，句子是不能作主语的。
1、that在句中不做成分。当主语从句位于句首时，不能省略：
That he likes books of this kind is very interesting.= It’s very interesting (that)he likes books of this kind.
这是用的最多的一种主语从句,但把这种主语从句放在句首是很少的,只是为了强调或谓语较长时才这样安排。例如：Thatpriceswill goupiscertain.
扩展资料
that的其他用法：
当谓语动词是seem、appear、bea pity、be a wonder、belikely等时，使用形式主语It，而将真正的主语放在句尾，这时从属连词that可省略：It appeared to scientists on earth (that) the stars had moved.
a、It+be+形容词+that从句：It isnaturalthattheyshouldhavedifferentviews.
b、It+be+名词+that从句：It’s ashamethatyou’resick.
c、It+动词（+宾语或状语）+that从句：It happenedthatshewasn’tinthatday.
d、It+动词的被动语态+that从句：It’s saidthattherehasbeenanearthquakeinIndia.