Our knowledge of computers growing all the time.? A.be B.is C.are D.were 题目和参考答案——青夏教育精英家教网—

题目内容

Our knowledge of computers__________growing all the time.?

A.be B.is C.are D.were

解析:

knowledge是不可数名词，作主语，谓语动词用单数。?

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