yu mei seems_______a lot these years a to change b to have changed c changed d have changed
题目
yu mei seems_______a lot these years a to change b to have changed c changed d have changed
答案
B (seem to do sth ,似乎做某事,TO 后用现在完成时“关键词是these years ),强调对现在造成的影响或结果‘这些年她改变了许多.
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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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