I don't think the experiment is ________ failure.At least we have gained ________ experience for future.
| A．/；the | B．a；the | C．a；/ | D．/；/ |
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I don't think the experiment is ________ failure.At least we have gained ________ experience for future.
| A．/；the | B．a；the | C．a；/ | D．/；/ |
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