--mike was late for work again today He ____ late everyday this week
题目
--mike was late for work again today He ____ late everyday this week
A is B was C has been D will be
答案
C ,因为最后的时间是一整个星期,所以要用持续状态,has been,例句,he has been here for three years
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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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