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several times, the young scientist still kept on making his experiments. [ ] A．H

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several times, the young scientist still kept on making his experiments. [ ] A．H

________ several times, the young scientist still kept on making his experiments.

[]

A．Having been failedB．Having failedC．Though failedD．Because of failure

试题答案

答案：B

标签：keptstillonhismaking

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