did you see a dog___(lie) on the road with your own eyes?
题目
did you see a dog___(lie) on the road with your own eyes?
they have never___(ride) a motorbike before
it's 12 years since hongkong ___(come)back to china
答案
lying see sb doing sth
ridden 现在完成时 have +过去分词
came 从句一般过去时
举一反三
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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