[题目]Ithe floor half an hour ago.but it's dirty again．题目和参考答案——青夏教育精英家教网—

题目内容

【题目】I(sweep)the floor half an hour ago，but it's dirty again．

【答案】swept
【解析】句意：我半个小时前拖了地板，但是它又脏了。根据“ half an hour ago”可知，时态为一般过去时。故填swept。

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