Newton was playing under an apple tree ----an apple fell onto his head.A.when B.while C.after D.before答案为什么是D呢?

Newton was playing under an apple treebefor an fell onto his head.求翻译、谢谢 英语难题 Newton was playing under an apple tree ______ an apple fell onto his head.A.when B.while请选一个并说为什么 Newton was playing under an apple tree ----an apple fell onto his head.A.when B.while C.after D.before答案为什么是D呢? Mr Newton was famous a_______ a sientist. Newton was playing under an apple tree___an apple fell onto his head.A.when B.while C.after D.before请问选择哪一个,及分别说出每个为什么对与错. Newton was playing under an apple()an apple fellonto his head.为什么是when,不是while.如若是while引导的主句和从句里的动词都必须是短暂性的吗 newton,the famous English scientist,was such a man 翻译 My mind was playing was playing computer games=? he was playing tennis with Isaac Newton(艾萨克·牛顿)was a great English scientist.翻译 Newton was the greatest scientist of his time.of his time 是什么成份? plays、played、is playing、was playing分别是什么意思 who was playing with the ribbon? tom was playing computer games（ ）. Newton was one of the greatest scientists ____ever lived.Newton was one of the greatest scientists ____ever lived.A.whom B.which C.what D.that 为什么选D,而不选B Mike was injured when he was playing football.(bad) One was the apple eaten by Adam in the Bible;one was the apple falling on the head of Newton;的翻译