下列有关物质的性质及应用均正确的是（　　）

A．常温下浓硫酸能使铝发生钝化，可在常温下用铝制容器贮藏贮运浓硫酸

B．氢氧化铁胶体具有很强的吸附性，可用于除去水中的所有杂质

C．二氧化氯具有还原性，可用于自来水的杀菌消毒

D．铜的金属活泼性比铁的差，可在海轮外壳上装若干铜块以减缓其腐蚀

—How do you find the health club?

—I          it. Everyone is saying its management is going from bad to worse.

A．ought to join

B．should have joined

C．would rather not have joined

D．would like to have joined