题干
What ______ had Bob walked farther, as far as the river bank?
A：would happe
B：could happe
C：would have happened
D：needn’t have happened
答案(点此获取答案解析）
C
A：would happe
B：could happe
C：would have happened
D：needn’t have happened
与年龄
（岁）的回归方程为
，下列叙述正确的是（ ）