摘要：8．I have ever found such a case the son refused to support his mother when she became too old to feed herself. A．that B．where C．when D．which 答案 B 解析 句意为:我从未遇到过这种情况.当母亲太老了不能养活自己时.儿子却拒绝赡养她.当先行词是case.situation.stage.point等表示“情形,阶段,程度 时.引导定语从句的词多用where.

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