题目:
Was it _____ he was playing volleyball on the playground _____ he got hurt? [ ]
A. that; when
B. when; that
C. that; where
D. where; 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:已知原子序数,可推断原子的①质子数;④核电荷数;⑤核外电子数;⑥原子结构示意图;⑦元素在周期表中的位置。因此选项是B。