核心问题
一九八三年全国研考第I.4题：
I am sure that ____ you said is wrong.
A. which B. all C. this D. what
标准答案规定选 D, 我认为亦可选 B。
词典解答
选 B 并不比选 D 逊色,请看下面的例句:
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All we had to do was figure out a name for the dog. (Hillary, Living History) 我们该做的只是替狗挑个名字。(希拉里，《亲历历史》)
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All I want is a room somewhere. (Practical English Usage, p. 38)
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All ____ is a continuous supply of fuel oil. A. what is needed B. that is needed C. the thing needed D. for their needs(TOEFL)
在上面的用法中, all 之后省略了充当宾语的关系代词 that (即使用了零关系代词)。充当主语的关系代词 that 则不能省略。(参见 all that/what)