i was sleeping late ___when _someone knocked on the door 为什么填when 而部填while 求详解

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• i was sleeping late ___when _someone knocked on the door 为什么填when 而部填while 求详解
• i was sleeping late ___when _someone knocked on the door 为什么填when 而部填while 求详解
• Peter was about to unlock the door when he found someone had broken into the
• he was sleeping late____someone knocked on the door 1.when 2.while 3.as 4.after