_________they arrived early at the airport,they never missed the flight.A.if B.because
题目
_________they arrived early at the airport,they never missed the flight.A.if B.because
A.if B.because C.as soon as D.although
why should it choose D.but not
答案
Because they arrived early at the aiport,they neve missed the flight.
I think B is right,not D.
举一反三
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．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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