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

他巳連續(xù)四個月集中精力學(xué)理科了。

9. has been concentrating on studying/learning在題干中有in a row表示持續(xù)的一段時間，表達"連續(xù)四個月學(xué)習(xí)理科"，所以要用現(xiàn)在完成進行時。

題目來源：高考英語組合訓(xùn)練多項選擇+完成句子 > 組合訓(xùn)練51-52

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