There are three underground lines in Chengdu.and several lines areunder construction．题目和参考答案——青夏教育精英家教网—

4．There are three underground lines in Chengdu，and several lines areunder construction．

分析成都已有三条地铁线，还有几条线正在建设之中．

解答答案：under．根据前面"…three underground lines"以及后句"are…construction"可知此处应填"正在建设之中"，而be under construction"正在建设之中"为固定搭配，故填under．

点评本题考查固定搭配的使用．根据句意推测出合适的固定搭配．

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