jim went to play basketball after he ____ his homework
题目
jim went to play basketball after he ____ his homework
空格处填 finished?还是had finished
答案
had finished ,这里面设计到了时态问题,相当于went to play来说,完成作业是一个完成式
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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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