She had studied Russian for three years _____ she began to learn English
题目
She had studied Russian for three years _____ she began to learn English
A.before B.if C.after D.because
我觉得是C,but我心里有个疑问,要是真的选C,如果再多一个选项：since 那么选since还是after
答案
应该选A,过去完成时表示在began这个动作之前就发生的动作.译为：在她开始学英语之前,她就已经学了3年俄语了
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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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