Trees take a long time to ______(grow/grow up)

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Trees take a long time to ______(grow/grow up)
Trees take a long time to ______(grow/grow up)

Trees take a long time to ______(grow/grow up)
grow up 成长,逐渐形成
单用GROW不行,因为这句话的意思是:
树木要花费很久才能成材.
长成,成长,的意思.
grow [ ɡrəu ] vi.发展;生长;渐渐变得…
vt.使生长;种植;扩展
[过去式grew 过去分词grown 现在分词growing ]

grow