It was only after he had read the papers    Mr. Gross realized the task before him was extremely difficult to complete.

A．when

B．that

C．which

D．What

门静脉高压症手术治疗的目的（）

A.消除脾功能亢进

B.降低门静脉压力

C.改善腹水

D.预防大出血

E.改善肝功能