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    9. He        science subjects for 4 months in a row. (concentrate)

    他巳连续四个月集中精力学理科了。

    9. has been concentrating on studying/learning在题干中有in a row表示持续的一段时间，表达"连续四个月学习理科"，所以要用现在完成进行时。

    题目来源：高考英语组合训练多项选择+完成句子 > 组合训练51-52

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