He often helps his mother_____ the housework
题目
He often helps his mother_____ the housework
A to do
B do
C with
D A,B and C
答案
应该选D,因为help sb (to) do sth ：帮助某人做某事.help sb with sth：帮助某人在某方面,故A/B/C选项都正确,因此选D
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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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