One day, an idea 17 Art Fry.
答案：(B) occurred to
occur to sb 意為「（想法）浮現在某人腦中」，主詞是想法、受詞是人：有一天 Art Fry 想到一個點子；come up with 的主詞必須是人，主客顛倒，threw at（朝…扔）與 looked down upon（瞧不起）語意也不合。
答對率 36%。
要說「想到一個點子」，你第一個想到的一定是 come up with。但問題在主詞：come up with 的主詞必須是人（Art Fry came up with an idea.），本句的主詞卻是 an idea、受詞才是人，主客剛好顛倒。
If a thought occurs to you, it comes into your mind. 常見句型是 It occurred to me that…（我忽然想到…）。同一組的還有 strike：That was when the thought struck him.（他就是在那時想到的）。記法：occur to／strike 的主詞是「想法」；come up with／think of 的主詞是「人」。
an idea occurs to sb（某人想到一個點子）、It occurs to sb that…（某人忽然想到…）、a thought strikes sb（某人腦中閃過一個念頭）、come up with an idea（想出點子）。
Art Fry was a researcher in the 3M Company. He was bothered by a small irritation every Sunday as he sang in the church choir. That is, after he 16 his pages in the hymn book with small bits of paper, the small pieces would invariably fall out all over the floor.
One day, an idea 17 Art Fry. He remembered a kind of glue developed by a colleague that everyone thought 18 a failure because it did not stick very well. He then coated the glue on a paper sample and found that it was not only a good bookmark, but it was great for writing notes. It would stay in place 19 you wanted it to. Then you could remove it 20 damage.
The resulting product was called the Post-it, one of 3M's most successful office products.