Christmas Day is a Christian great day held on December 25th in honour of the birth of Christ,______
题目
Christmas Day is a Christian great day held on December 25th in honour of the birth of Christ,_______ many events will be held
1.when
2.which
3.where
4.that
答案
1.when
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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