Mr Lee found it hard _______(travel) in the city.
题目
Mr Lee found it hard _______(travel) in the city.
答案
Mr Lee found it hard to travel_______(travel) in the city.
find it hard/easy/good to do sth
这个是固定搭配的,要记住就好~
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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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