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It was____the old worker came that we____the experiment.

A.until;didn’t begin B.not until;began  
C.until;began D.not until;didn’tbegin 

B

解析试题分析:通过分析句子结构,可知这个句子包含一个强调句。题目中含有It was,出现这样的结构,首先要考虑它是不是强调句。如果把这种句型结构划掉后,应该是一个完整无缺的句子;这也是判断强调句型与其它从句的方法。 假设它是强调句,去掉it was和that,剩下的句子经过调整语序后是一个完整的句子,所以是强调句型,对时间状语进行强调。强调句的结构It is/was+被强调部分 + that + 句子的其他成分,如果被强调的部分是人,可以用who代替that。not...until 的强调结构,其基本句型为:It is (was) not until (时间状语) that (不用否定)所以选B。
考点:强调句的考查
点评:结合近几年有关高考题的特点,将其变化形式归纳如下:强调句型的一般疑问句形式。一. 句式特征:Is/ Was it +被强调部分+ that…; 二、 结合特殊疑问词构成特殊疑问句形式。句式特征:特殊疑问词+is/was it that…? 三、 强调句型的反意疑问句形式。句式特征为:It is/was+被强调部分+that…,isn’t / wasn’t it?四、强调句型的感叹句形式。句式特征为:what/ how … it is (that) +主语+谓语!

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