26． The shopkeeper did not want to sell for _______ he thought was not enough.
A. where B. how
C. what D. which
一、 what用作关系代词，也即连接代词，引导名词性从句, 可以作主语、宾语、定语
例1 What made the school proud was that more than 90％ of the students had been admitted to key universities. 使学校骄傲的是90％的学生被重点大学录取。
例2 What makes the matter worse is that it begins to rain. 更糟糕的是开始下起雨来了。
例3 —Are you still thinking about yesterday’s game ?
—Oh, that’s what makes me feel excited.
例4 The city is not what it used to be. 这个城市不再是先前的模样了，
例5 A man’s worth lays not so much in what he has as in what he is. 人的价值不在于他有什么，而在于他是怎样的人。
例6 After what seemed like hours he came out with a bitter smile. 好像过了几个小时以后，他面带苦笑走了出来。
二、 what 用作关系形容词，作定语。意为“所…… 的全部,任何的”；与little、few 连用时，其含义多为“虽然少，但把所有的都…… ”
例7 The home improvements have taken what little there is of my spare time. 家庭环境的改善占去了我仅有的一点业余时间。
例8 Don’t worry. I will give you what help I can. 别担心，我一定尽我所能帮你。
例9 I will lend you what few reference books I can spare. 我愿把我用不着的虽然为数不多的参考书全部借给你。
三、 what惯用句式：A is to B what C is to D （比喻结构）A对B之关系犹如C对D之关系
例10 Air is to us what water is to fish. 空气对于我们犹如水对于鱼。
例11 What salt is to the food, wit and humour a