句中by the 1920s“到了20世纪20年代”。“by+时间名词”,常在句中作时间状语。 基本结构:It is/was+被强调部分+that/who+其他.
一般疑问结构:Is/Was it+被强调部分+that/who+其他? 特殊疑问结构:疑问词+is/was+it+that/who+其他? not ... until结构:It is/was not until ...that ... 强调句
定语从句
* * 多指由于某种外界因素,如“插嘴”而中断、打断别人的讲话或活动 interrupt 指人的心情、睡眠、安静被干扰、妨碍,还可表示“使……不安” disturb by 表示“在……之前,不迟于”,后常接表示时间点的名词。若后接过去时间,则用过去完成时;若接将来时间,则用将来完成时。 状语从句的省略,相当于If they are breathed in。 “it was ... that ...”是强调句型。该句型中,被强调的部分必须是除了谓语动词以外的句子成分,当被强调部分指人且作主语时,that可以用who代替。
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