问题
选择题
Our knowledge of computers __________ growing all the time.
A．be
B．is
C．are
D．were
答案
答案：B
由all the time 可知本句要用现在进行。knowledge是不可数名词，故be动词用is。
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Our knowledge of computers __________ growing all the time.
A．be
B．is
C．are
D．were
答案：B
由all the time 可知本句要用现在进行。knowledge是不可数名词，故be动词用is。