yestoday evening they were having their supper a guest came to visit them suddenly
题目
yestoday evening they were having their supper a guest came to visit them suddenly
A.as B.while C.when Duntil
答案
Yesterday evening they were having their supper (C.when) a guest came to visit them suddenly.
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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