有关特发性肺纤维化的叙述不正确的是（）。

A.肺内病变分布不均一

B.逐渐加重的劳力性呼吸困难

C.体检时可发现呼吸浅快

D.严重时发展为Ⅰ型呼吸衰竭

E.激素治疗效果好

Can you tell me ______ when I called you?

A．what were you doing

B．what are you doing

C．what you are doing

D．what you were doing