您在《英语常见问题解答大词典》一书中为 attend on(侍候)举了下面的例子：
She has many servants attending upon her. (她有许多仆人侍候她。)
但是,这个句子并没有出现 attend on,是否举例不当?
您忽略了一点:on 与 upon 在多数情况下都是可以互换的。但是 upon 大都用于较正式语体。例如：
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I did not say anything to him upon the subject. 关于这个题目我对他什么也没有说。
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He examined the red bell rope, the end of which lay upon the pillow of the bed. 他察看了那根红色的铃绳，绳子的一头放在床铺的枕头上。
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I shall be happy to give up my part of Shylock's money. Shylock must promise to leave the money upon his death to his daughter and her husband. 我将高兴地放弃我应得的夏洛 克财产的那一半。夏洛克必须答应在他死后把这笔财产留给他的女儿和女婿。
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In any small country like England, with a growing population, there is always the danger that the wide, open spaces will be built upon and their beauty destroyed. 在任何一个像英格兰这样小的国家里，由于人口的不断增长，总是存在着把广阔的空旷场所用来建屋造房而使其美景受到破坏的危险。
请做下面的英语试题：
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Without facts, we cannot form a worthwhile opinion for we need to have factual knowledge ____ our thinking. A. which to be based on B. which to base upon C. upon which to base D. to which to be based(全国六级,91.6-64)
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She wants to know whether the measures have been agreed ____.
A. to B. with C. about D. upon E. over(全国研考)