In the last few years,a growing number of Americans in their 20s and 30s __ for China for employment
题目
In the last few years,a growing number of Americans in their 20s and 30s __ for China for employment, attracted by its faster-growing economy.
A.headed B.are heading
C.have been heading D.had headed
答案选C,我想问这句话是什么意思?
答案
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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