【題目】We should start a good habit like brushing our (tooth) twice a day.

【答案】teeth
【解析】句意:我們應(yīng)該開始一個(gè)好習(xí)慣像一天刷兩次牙。表示“我們的牙齒”,應(yīng)用tooth的復(fù)數(shù)形式,故為teeth。

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