题目：
The police were seeking more information to find out _____ the rich merchant.[ ]
A. who was it that killed
B. who it was that killed
C. it was who killed
D. who was it killed
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：A、同一元素可能既表现金属性，又表现非金属性，如Al元素，错误；B、第三周期所有元素的最高正化合价等于它所处的主族序数，正确；C、短周期元素形成离子后，最外层电子都达到稳定结构，不一定...
