He_eating American food since he came here.Aused toBhave been usedChave been used toDwas used to
题目
He_eating American food since he came here.Aused toBhave been usedChave been used toDwas used to
答案
好像没正确选项,应该是：has been used to （ 因为SINCE常一现在完成时连用,主语是第三人称单数,应该用has. be used to doing sth 习惯于做某事)
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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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