胰腺癌的首发症状一般是（）

A.消瘦

B.黄疸

C.上腹痛及上腹饱胀不适

D.出血

E.发热

I don’t understand how he can say that everything is fine ________ it’s so obvious that it’s not.

A．unless

B．when

C．so that

D．in case