【題目】The students have been active p(參與者) in the discussion in their classes.

【答案】participants
【解析】句意：這些學(xué)生很明顯都是班級(jí)討論的積極參與者。participant名詞“參與者”，本句的主語(yǔ)是the students，所以也應(yīng)該使用復(fù)數(shù)形式，故填。participants

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