With so many people in English every day, we can see it will be more and more important a good knowledge of English．
A. to municate, have
B. municate; having
C. municating; to have
D. municated; to have
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A. to municate, have
B. municate; having
(答案→)C. municating; to have
D. municated; to have
解析：考查非谓语动词，第一空填municating; 做宾语补足语，因为municate和people是主动关系，第二空填 to have做主语，前面的it是形式主语，句型是：It is+adj+to do，句意是：每天有越来越多的人用英语交流，我们知道掌握英语越来越重要了。选C。