-I bet someone stole my backpack. -Well.you have kept an eye on it. A．may B．can

—I bet someone stole my backpack.

—Well，you________have kept an eye on it.

A．may 　B．can C．would 　D．should

试题答案

D

should have done表示“本应该做某事却没做”，即你本应该看好自己的背包的。keep an eye on意为“留心，注意”。