题目:
—What did he want to know,Anne?
—_______I could finish writing the report.[ ]
A.When it was that
B. It was when that
C. It was when
D. When was it that
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:根据题意可知:X是Mg;Y是F。A.X、Y形成化合物表示为XY2,错误;来B. X、Y形成的化合物MgF2中所含离子都是10电子微粒.正确;D. 对于电子层结构不同的原子来说,原子核外电子层数越多,原子半...