The play had already been on for quite some time when we ____ at the New Theatre.[2007 浙江卷]
题目
The play had already been on for quite some time when we ____ at the New Theatre.[2007 浙江卷]
A.have arrived B.arrived C.had arrived D.arrive
答案
B.arrived
主句用过去完成时态（过去的过去）,从句用一般过去式（过去）即可.表示戏开始（had been on）发生在达到（arrived）之前.
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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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