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. a; 不填 C. a ; a D. 不填; a
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. a; 不填 C. a ; a D. 不填; a
B