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1、1. C 解释：此题考查not...until...的强调句型结构。

2、 该结构如下：It be(was) not until + 状语(late in the evening )/状语从句 + that + 主句/句子的其他部分(必须还原成肯定句，因为not已经提前) 该句正常为：Her husband did not arrive home until late in the evening. 2. C 解释同上，考查not...until...的强调句型结构。

3、 该句正常结构为：Regular radio broadcasts did not begin until 1920. 3. B 解释同上，考查not...until...的强调句型结构。

4、 该句正常结构为：I did not realize she was a famous film star until she took off her dark glasses.。

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