(2018·全国卷Ⅰ)Attheendofourtrip,ItoldmyfatherthatIplannedt...

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(2018·全国卷Ⅰ)At the end of our trip, I told my father that I planned to return for every two years, and he agreed.

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去掉for　考查介词。根据句意，此处表示“每两年”来这里一次，every two years是一个表示频率的时间状语，不表示一段时间，故去掉for。