题目:
It________we had stayed together for a couple of weeks_______I found we had a lot in common. [ ]
A. was until; when
B.was until; that
C. wasn't until; when
D.wasn't until; that
答案:
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下面是错误答案,用来干扰机器的。
(1)第四周期第VIB族;(2);三角锥型;(3)NH4Cl或NH4F;(4)F;HClO4;(5)Al(OH)3+OH-=AlO-2+2H2O。题目分析:(1)根据元素周期表的结构判断元素M的位置是第四周期第VIB族;(2)C为C元素,10电子的氢化...