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
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
D