单选题 Without the music, the children would have not had so much fun.
A. wouldn't be having B. wouldn't have been
C. wouldn't be D. wouldn't have had

【正确答案】 D

【答案解析】[解析] 结构应用。
当有两个以上的助动词时，not跟在第一个助动词之后。介词短语without the music可代替虚拟条件从句；本句表达的是与过去事实相反的假设，后面的主句谓语应用would + have+过去分词；因此选项D是答案。