【題目】He (not clean) the classroom at the moment.

【答案】isn't;cleaning
【解析】句意:此刻他沒有在打掃教室。at the moment此刻,現(xiàn)在,是現(xiàn)在進(jìn)行時的標(biāo)志。be+動詞-ing 構(gòu)成現(xiàn)在進(jìn)行時,表示正在進(jìn)行的動作,故填isn't cleaning。

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