题型:问答题 简答题 — You've forgotten _______ the milk again, Mike. — I'm 'afraid so. But I don't remember you ________ me to buy it. [ ]A. to buy; to tell B. to have bought; to have told C. having bought; were telling D. to buy; telling 查看答案
题型:问答题 简答题 短周期元素甲、乙、丙、丁的原子序数依次增大,甲和乙形成的气态化合物的水溶液呈碱性,乙位于第VA族,甲和丙同主族,丁原子最外层电子数与电子层数相等,则A.原子半径:丙>丁>乙B.单质的还原性:丁>丙>甲C.甲、乙、丙的氧化物均为共价化合物D.乙、丙、丁的最高价氧化物对应的水化物不能相互反应 查看答案