可导致出血性膀胱炎，引起尿频、尿痛

A．阿霉素
B．环磷酰胺
C．博来霉素
D．顺铂
E．L-门冬酰胺酶

I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.

A．不填; 不填

B．不填; a

C．a; a

D．a; 不填