last night,Tommy fall off his bicycle and ( )(hurt)hislegs.适当形式填
题目
last night,Tommy fall off his bicycle and ( )(hurt)hislegs.适当形式填
答案
last night,Tommy fall off his bicycle and ( hurt )(hurt)hislegs
这里要用hurt的过去式,但过去就是它本身,故填hurt.
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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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