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

【答案】swept
【解析】句意:我半個(gè)小時(shí)前拖了地板,但是它又臟了。根據(jù)“ half an hour ago”可知,時(shí)態(tài)為一般過(guò)去時(shí)。故填swept。

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