女性，25岁，无明显诱因咳嗽，稍许咳痰4个月．无咯血，无发热，有时感乏力。查体：无发绀，右胸骨旁可闻及局限吸气相干鸣音，最可能的诊断是（）

A.支气管扩张

B.支气管内膜结核

C.慢性肺脓肿

D.浸润性肺结核

E.支气管肺癌

His writing is so confusing that it's difficult to make out          it is that he is trying to express. [ ]

A. that      

B. how    

C. who    

D. what