They had succeeded _______ the task in time.
题目
They had succeeded _______ the task in time.
A
at completing
B
to complete
C
in completing
D
complete
答案
C
succeed in doing 是一个固定短语,表示成功的做了某事 .
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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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