The first great invention was ___ that is still important---the wheel.The first great invention was ___ that is still important---the wheel.1.the one2.one这句是什么从句?请分析题目,

定语从句
the one 指代后面的the wheel
正常语序应该是这样的：The first great invention was the wheel——the one that is still important.
从句部分是：the one that is still important.

1
the one 代 the first great invention 后为定语从句， 有特指意味，所以要the
第一个最伟大的发明现在仍然很重要， 那就是*。
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1.the one

1. the one
定语从句。

答案应选 2.one；
one 后省略了 invention,直接把下面两条句子组合成了复合句：
The first great invention was the wheel.
One invention that is still important (today) is the wheel.
组合后的句子也可以换种方式排列而意思不变：
The first great invention was the wheel,one that is still important.
这样就看得比较清楚成分：the wheel 是宾语,而 one 引导从句作为宾补.