【单选题】【消耗次数：1】
The reason why he didn’t take the exam was _____ he had an accident on his way to the school.
①
because
②
because of
③
that
④
due to
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③
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①
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②
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④
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Because he hadnt finished his assignment, so he continued working in the classroom. Is this a complete sentence?
①
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②
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①
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③
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①
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随机题目
【单选题】
关于假设检验，下列错误的是（）
①
假设检验的基本思路是首先对总体参数值提出假设，然后再利用样本提供的信息去验证先前提出的假设是否成立。
②
假设检验应确定拒绝域并做出拒绝还是接受H的统计判断。
③
要根据研究目的来建立零假设和备择假设。
④
一般来讲，应该先确定零假设，再确定备择假设。