She's always been interested in keeping fit.为什么句中要用been

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She's always been interested in keeping fit.为什么句中要用been

be interested in对.感兴趣
整个句子的时态是现在完成时,构成形式:主语+ have / has +动词的过去分词,she's= sha has ,be 的过去分词是been

be interested in 固定搭配
完成时