They have been working ____ a teacher for 10 years.
题目
They have been working ____ a teacher for 10 years.
A. at B. in C. as D. of
答案
C.as
work as a teacher固定短语,“当老师”的意思.work as +a +职业 常用短语“当.”
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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．
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