our knowledge of computers________后面是加单数还是复数主语是哪一个 .是knowledge还是computer.

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ourknowledgeofcomputers________后面是加单数还是复数主语是哪一个.是knowledge还是computer.ourknowledgeofcomputers________

our knowledge of computers________后面是加单数还是复数主语是哪一个 .是knowledge还是computer.
our knowledge of computers________后面是加单数还是复数
主语是哪一个 .
是knowledge还是computer.

our knowledge of computers________后面是加单数还是复数主语是哪一个 .是knowledge还是computer.
中心词是knowledge,谓语用单数!