They can play basketball very well 同义句转换
题目
They can play basketball very well 同义句转换
答案
They are able to play basketball very well.情态动词can相当于be able to,但后者时态比较多,比如一般将来时与过去将来时,一定是will be able to,would be able to,现在完成时和过去完成时是have/has been able to...
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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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