【題目】①We (clean) the classroom already .②We (clean) the classroom yesterday afternoon .

【答案】have cleaned;cleaned
【解析】①句意:我們已經(jīng)打掃教室了。由already可知用現(xiàn)在完成時(shí),其結(jié)構(gòu)為have/has+過(guò)去分詞,主語(yǔ)為we,用have,所以答案是have cleaned。
②我們昨天下午打掃教室了。根據(jù)yesterday afternoon可知該動(dòng)作發(fā)生在過(guò)去某一時(shí)間,用一般過(guò)去時(shí),所以答案是cleaned。

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