Provided that the printing press had not been invented,, If Thomas Edison had not developed the electric light bulb,, If the Wright brothers had not achieved powered flight,, If Marie Curie had not discovered radioactivity,, If the Iphone had not been widely adopted,, If Nikola Tesla had not worked on alternating current (AC) electricity,, Provided that the World Wide Web hadn't become popular,.

Third conditional

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？