in the past few years,they ———many children find their families.
题目
in the past few years,they ———many children find their families.
a help
b will help
c were helping
d have helped
答案
c
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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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