【題目】The doctor told Windy to exercise at least _________ a week if she wanted to keep healthy. (two)

【答案】twice

【解析】

句意：醫(yī)生告訴溫蒂，如果她想要保持健康的話，每周至少要運動兩次。

根據(jù)后面的“…a week”和提示詞可知，是指一周兩次，故把two改成它相對應(yīng)的副詞形式。故填twice。

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