There are four underground lines in Beijing, and several lines are under construction(建设)

发布时间：2020-08-17 13:36:43

There are four underground lines in Beijing, and several lines are under construction (建设)

网友回答

解析：写对该单词即可，注意用名词。Under construction “正在建设中”句意为“北京有四条地下线路，并有几条正在建设中。”
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