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4.        his lesson,he didn't notice his mother coming in. (concentrate)

全神貫注于他的功課，他絲毫沒有發(fā)現(xiàn)他的媽媽進來了。

4. Concentrating on/Concentrating himself on/ Concentrating his mind on concentrate表示"聚精會神，集中思想"時,是不及物動詞，多和on/ upon連用。此處是現(xiàn)在分詞短語作狀語，表原因。

題目來源：高考英語組合訓練多項選擇+完成句子 > 組合訓練1-2

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