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    (   ) 3. You       finish your homework before you play computer games.

    A. ought    B. ought to

    C. oughted to    D. oughts to

    3. B情态动词ought to没有人称和时态的变化。 故选B。

    题目来源：仁爱英语同步练习簿九年级上下册 > Topic 3 What can we do at home to protect the environment？

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