he _____a member of the club for about a year.how _____ you ______(come) to school this moring?
题目
he _____a member of the club for about a year.how _____ you ______(come) to school this moring?
you are late.the meeting—— for about ten minutes.
A.has begun B.began c.has been on D.has been
答案
he _has been____a member of the club for about a year.how __did___ you ___come___(come) to school this moring?
C
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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