上海精细化工园区:been的原形,什么意思
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原形是be,意思:是。
其他形式:现在:is,are,am
过去:was,were
过去分词:been
...........be
been的原形是be,been是be的过去分词形式.
意思是"是..."
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been的原形,什么意思
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