You should go over the books before _a test.A.you taking B.take C.taking D.you took
题目
You should go over the books before _a test.A.you taking B.take C.taking D.you took
答案
C
before既是介词也是连词
看作介词的话,则后面接名词 taking
看作连词的话,则后面接句子,before you take (根据前面的句子,判断应该用一般现在时）
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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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