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here is such a big stone( )no man can lift.为什么答案是as不是that?不是

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here is such a big stone( )no man can lift.为什么答案是as不是that?不是定语从句么?那从句里少了it,应该填that作成分的呀!
as引导定语从句时的用法
①as引导限制性定语从句通常用于the same … as, such … as结构中.
e.g. I want the same shirt as my friend’s. 我要一件跟我朋友一样的衬衫.
Such machines as are used in our workshop are made in China. 我们车间使用的这种机器是中国制造的.
②as引导非限制性定语从句既可放在主句之前,也可放在主句之后,用来修饰整个句子.通常用下列句型:as is known to all, as is said, as is reported, as is announced, as we all know, as I expect 等.
e.g. As I expected, he got the first place again in this mid-term examination. 正如我所预料的那样,他在这次期中考试中又获得了第一名.
as 引导非限制性定语从句时与which的区别
①当主句和从句语义一致时,用as;反之,用which来引导非限制性定语从句.
e.g. He made a long speech, as we expected.
He made a long speech, which was unexpected.
②当非限制定语从句为否定时,常用which引导.
e.g. Tom drinks a lot every day, which his wife doesn’t like at all.
这里面的第一条就是你的答案
呵呵,希望能帮到你