Have you ever been to our town before?No,this is the first time I _________here.
题目
Have you ever been to our town before?No,this is the first time I _________here.
A.had been
B.came
C.have been
D.was coming
答案
C.have been 为正确选项.
this is +first/second...+time （that）+从句,从句要用现在完成时态.
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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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