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 |
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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 |