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

他巳連續(xù)四個(gè)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(shí)間，表達(dá)"連續(xù)四個(gè)月學(xué)習(xí)理科"，所以要用現(xiàn)在完成進(jìn)行時(shí)。

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

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