People,young and old ,short and tall,thin and fat,___it very often.A.use B.uses C.using D.used选哪
题目
People,young and old ,short and tall,thin and fat,___it very often.A.use B.uses C.using D.used选哪
答案
A people是复数
你可以只看people often use it ,
young and old ,short and tall,thin and fat这些是定语,扰乱你的判断
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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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