肿瘤标志物检测作为肿瘤诊断的重要辅助手段，对检测的质量有较高的要求。实验室常采用_______、______________和__________质控。

— Mary, can you take good care of ________ while I’m not at home?

— Of course, I can.

A．myself

B．ourselves

C．yourself

D．yourselves