问题
选择题
Our knowledge of computers__________growing all the time.
A．be
B．is
C．are
D．were
答案
B
knowledge是不可数名词，作主语，谓语动词用单数。
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Our knowledge of computers__________growing all the time.
A．be
B．is
C．are
D．were
B
knowledge是不可数名词，作主语，谓语动词用单数。