______is well known，data under-determines theories.A.AsB.ThatC.WhatD.Which
______is well known，data under-determines theories.
A.As
B.That
C.What
D.Which
B.That
C.What
D.Which
参考解析
解析：本题考查非限制性定语从句。
题目意为“众所周知，数据不足说明理论。”逗号后面部分成分完整，逗号前面需要既能连接句子，又能引导句子的引导词，同时能做主语，只有as符合要求。as is well known， 众所周知，as 引导非限制性定语从句，在从句中做主语，代替逗号后的整个句子。选择A。
考点
定语从句
题目意为“众所周知，数据不足说明理论。”逗号后面部分成分完整，逗号前面需要既能连接句子，又能引导句子的引导词，同时能做主语，只有as符合要求。as is well known， 众所周知，as 引导非限制性定语从句，在从句中做主语，代替逗号后的整个句子。选择A。
考点
定语从句
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