That’s really a        problem; no wonder all the students looked       .

A．puzzled; puzzling

B．puzzled; puzzled

C．puzzling; puzzling

D．puzzling; puzzled

以下哪种肝脏肿块在囊肿内有子囊（）

A.多囊肝

B.包囊虫病

C.肝癌

D.肝血管瘤

E.肝脓肿