题目: —Did Linda see the traffic accident? —No, no sooner ____ than it happened. [ ]A. she had left B. she left C. did she leave D. had she left 答案: 答案:D
题型:填空题 (8分)有的油田开采的石油中溶有一种碳氢化合物——金刚烷,它的分子立体结构如图所示:(1)由图可知其分子式为:____________。(2)它是由_________ 个六元环构成的六体的笼状结构,其中有_________个,碳原子为三个环共有,连2个氢原子的碳原子数有 个。 查看答案