the station,he found his wife__for him
题目
the station,he found his wife__for him
A.on his arrival ,waiting
B.on arrivaing,wait
C.arriving,wait
答案
A on one 's arrival 在某人到达某地时
find somebody doing something
发现某人在干某事
在他到达车站时 他发现自己妻子在等着他
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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