问题
选择题
I don't think the experiment is ________ failure. At least we have gained ________ experience.[ ]
A. a; an
B. a; /
C. /; an
D. /; /
答案
答案：B
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I don't think the experiment is ________ failure. At least we have gained ________ experience.[ ]
A. a; an
B. a; /
C. /; an
D. /; /
答案：B