the manager came over and asked the customer how______.
题目
the manager came over and asked the customer how______.
A.did the quarrel came about
B.the quarrel had come about
C.the quarrel has come about
D.had the quarrel come about
答案
首先A和D的语序错误,要陈述句语序才行,然后came over是过去时,所以后面从句要用过去完成时选B
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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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