【单选题】【消耗次数：1】
Seeing the enemy, the hero was behaving as though nothing______.
①
was happening
②
would happen
③
had happened
④
happened
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相关题目
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He____________ working as if nothing had happened.
①
continue
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continues
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continuing
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continued
【单选题】
____ find out what had happened.
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critical
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What’s happened to Jan?_______to hospital.
①
She’s been taken
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①
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②
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③
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was promising
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随机题目
【单选题】
对于正态分布，抽取容量为10的样本，算得样本均值，样本方差，给定显著水平，检验假设.则正确的方法和结论是（）
①
用检验法，查临界值表知，拒绝
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用检验法，查临界值表知，拒绝
③
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设灯泡使用寿命在2000小时以上的概率为0.15，如果要求12个灯泡在使用2000小时以后只有一个不坏的概率，则只需用（）即可算出。
①
全概率公式
②
古典概型计算公式
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贝叶斯公式
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贝努利概型计算公式