Losing in thought,he bumped into a passer-by.
题目
Losing in thought,he bumped into a passer-by.
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答案
lost in thought,he bumped into a passer-by .be lost in /be dressed in / be armed with 等在做状语的时候被省略了从句中的when 和系动词 be 而来的seated /sitting in the classroom ,she thought she was the o...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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