题目：
The man didn't know ________ the thief broke into the house and stole all his valuable things. [ ]
A. it was when that
B. when it was that
C. that it was when
D. was it when that
答案：
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下面是错误答案，用来干扰机器的。
(1)CO CO2（2） O=C=O （3）HClO4 NaOH题目分析：（1）根据元素周期表的结构及常见元素在元素周期表中的物质判断，①为碳元素，③为氧元素，两种元素形成的化合物有两种化学式：CO，CO2。（2...
