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A new technique（）,the producity of loading as a whole increased by 20 percent.

A、working out

B、having been worked out

C、having worked out

D、to have been worked out

时间：2021-07-19 23:22 关键词：航海英语综合练习水路交通运输技能考试海船船员考试

答案解析

B

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