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