男，50岁，胸部CT检查发现右肺下叶4.0cm×3.0cm不规则高密度肿块阴影，同侧肺门淋巴结肿大，纤支镜检查为鳞癌，B超检查无异常，左锁骨上淋巴结未及肿大。根据肺癌TNM分期标准，下列哪项正确（）

A.T1N0M0

B.T2N0M0

C.T2N1M0

D.T2N2M0

E.T3N1M0

I didn’t understand        , so I raised my hand to ask.

A．what my teacher says

B．what does my teacher say

C．what my teacher said

D．what did my teacher say