when did the accident happen?怎麼回答?

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• where did it happen?怎麼回答?答案是near Lantau Island.不过我要完整句子啊
• used to ,did use to 是过去还是现在?I used to swim in high school, but I don't have time anymore.的意思是说 我曾经在学校的时候经常游泳,但现在没时间了.那麼 where did he use to swim? 是问他经常去哪里游泳?还是他曾经在哪里游泳啊!when did he use to get up? he used to get up at seven o'clock.这2句怎麼翻译呢 这不是过去式咩?
• Did you see the accident ________when you were walking past?A.to happen B.happenC.happenedD.is happening选哪个,为什么要专业,还有哪种情况和这个一样,举个例子.
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• when did the accident happen?怎麼回答?
• When did the car accident happen?(同义句）
• 已知25度时,电离常数：Ka(HF)=3.6x10^-4mol,溶度积常数：Ksp(CaF2)=1.46x10^-10mol^3/L^3.现向1L0.2mol/L HF溶液中加入1L0.2molCaCl2溶液.
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