These brightly colored bicycles can be seen everywhere．Theyare locked by the user after riding.and then unlocked by the next rider with a mobile phone．题目和参考答案——青夏教育精英家教网—

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9．These brightly colored bicycles can be seen everywhere．Theyare locked（lock） by the user after riding，and then unlocked by the next rider with a mobile phone．

分析这些色彩鲜艳的自行车随处可见，骑行后被用户锁定，然后由下一个骑手用手机解锁．

解答答案：are locked 分析句子得知，主语they指的是bicycles，根据后文unlocked by the next rider with a mobile phone被下一个骑手用手机解锁，主语是动作的承受者，因此是被动语态，结合前文时态can be seen，故这里用一般现在时的被动语态，主语they是复数，故用are locked．

点评解答此类试题时，务必充分理解句子的意思，正确分析句子的结构和成分，使用单词的正确形式．

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