But for their help, we        the program in time.

A．can not finish

B．will not finish

C．had not finish

D．could not have finished

流行性出血热的基本病变是（）

A.小血管内皮细胞肿胀、变性、坏死

B.组织水肿、出血

C.肌纤维变性坏死

D.组织细胞脂肪变性

E.组织退行性变