Firsttheprofessorgaveusabriefintr

发布时间：2020-07-27 12:34:25

First the professor gave us a brief introduction to his research and then he showed us how to find out the secret of it at full ________．A.depthB.lengthC.widthD.height

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B解析他详细地给我们讲了他是怎样发现这个秘密的。at full length：详细地。
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