【題目】People should open the window in the morning to make air (circulation) in order to keep the indoor air fresh.

【答案】circulate
【解析】句意:人們應(yīng)該在早上打開窗戶讓空氣流通,以保持室內(nèi)空氣新鮮。circulate“循環(huán),流通”;make sb do固定短語,“讓某人做.....”不帶to的動詞不定式作賓語補足語,故填circulate。

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