In some foreign countries, such as Canada, children usually leave their parents when they grow up. It makes the old feel ________.A.aloneB.lonelyC.frightenedD.enjoyable
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B解析alone强调单独一人；lonely孤独的，强调内心的感受；frightened可怕的；enjoyable令人愉快的。根据题意推断感觉孤独的，是内心的感受。