2. 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 |
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2. 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 |