2道英语选择题目,已给出答案,请解释一下为什么选这个.
题目
2道英语选择题目,已给出答案,请解释一下为什么选这个.
Nick bought a new camera.He _C_ lots of pictures with it.
A had taken B has took C has taken D had took
There was a fire in the street last night,but the firemen _D_ within twenty minutes.
A took it out B brought it out C worked it out D put it out
答案
表示一个状态 他已经拍了很多张照片了
应用现在完成时 B不对的原因是take 的过去分词应该是taken
put out 其余三个词组没有这个意思
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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