题目

.Thomas didn't come to school for the meeting, did he? …No. He    . The meeting had been cancelled. A. shouldn't have come  B. should not come C. didn't need to come  D. wouldn' t have come 答案：C 解析: 略A﹣G是初中化学常见的物质，其中E为红色粉末．如图为这些物质的转化关系图，其中部分生成物和反应条件已省略． （1）请写出G的化学式： ．（2）写出D→F的化学方程式；该反应的基本反应类型是 ．