He always studies () his own at homeA.in.B.to.C of.D.on我觉得是c,

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He always studies () his own at homeA.in.B.to.C of.D.on我觉得是c,

He always studies () his own at homeA.in.B.to.C of.D.on我觉得是c,
He always studies () his own at home
A.in.B.to.C of.D.on
我觉得是c,

He always studies () his own at homeA.in.B.to.C of.D.on我觉得是c,
应该是D吧.on one's own表示独自,独立,似乎相当于by oneself.这里句子的意思是他在家时总是独立学习.所以用on.