题干
13.－ I didn’t go fishing last Sunday because my car broke down..
－You ______ mine. I was not using it.
A：could borrow
B：could have borrowed
C：must have borrow
D：should borrow
答案(点此获取答案解析）
B
的部分图象如图所示，则
的图象可由函数
的图象（纵坐标不变）变换如下