He likes watching dolphins to swim and jump in the water.
题目
He likes watching dolphins to swim and jump in the water.
改错
答案
He likes watching dolphins swimming and jumping in the water
前后的时态要一样啊~前面是ing后面也是.他们是一个句子
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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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