2道英语选择题目,已给出答案,请解释一下为什么选这个.

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