请教一个英语语法,告诉我为什么这句话不错
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A 64 bit OS(主语)is highly recommended(谓语)as building on 32 bit OS is constantly becoming harder, is a lot

slower and is not actively maintained(原因状语从句).

从句中的三个is分别引导系表结构,并列跟在主语building on 32 bit OS后.

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