When did the train ___ Half an hour ago
题目
When did the train ___ Half an hour ago
A came
B get
C arrive at
D arrive
Are you free ___ next month?Yes,I will have a holiday
A in
B on
C /
D until
You'd better _____ ____ (not talk)in class
答案
1.D
2.C
3.not talk
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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