He_eating American food since he came here.Aused toBhave been usedChave been used toDwas used to

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He_eating American food since he came here.Aused toBhave been usedChave been used toDwas used to

好像没正确选项,应该是:has been used to ( 因为SINCE常一现在完成时连用,主语是第三人称单数,应该用has. be used to doing sth 习惯于做某事)