关于对员工惩罚的说法，错误的是（）。

A.惩罚的方法可灵活多样

B.惩罚要合理，使受罚者罚而无怨，口服心服

C.惩罚应采用公开透明的方式

D.惩罚要言行一致，严格按照制度规定执行

The old couple has ____ a lot since their only son was killed in an accident two years ago.

A．looked through

B．gone through

C．got through

D．passed through