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语法填空Albert Einstein was born in Germany on 14th,1879.When he

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语法填空
Albert Einstein was born in Germany on 14th,1879.When he was a yong boy ,he used to ask lots of questions.1__the time he was fourteen,Einstein had taught himself 2__(advance)mathematics.He already knew 3__he wanted to be when he grew up.he wanted to study physics and do research.
我认为1楼的第一个是BY第二个应该是ADVANCED
语法填空Albert Einstein was born in Germany on 14th,1879.When he
第一个是填By 意思是在……之前 翻译是在他14岁之前,他就开始自学高数.had done 是说自学这个动作发生在过去(14岁)的过去,所以用By很恰当.至于第二个就是填advanced,我查了一下 Advanced Mathematics 英语中那是指线性代数,概率论,函数论,拓扑学等等.第三个填what 首先what引导宾语从句,然后再从句中作be的宾语.