What an important part the Internet in our life! One can hardly imagine life would be like

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A. has; how
B. is; however
C. uses; what
(答案→)D. plays; what
解析：考查固定词组和宾语从句。第一空的固定词组play a part in…在…中起重要作用；把part提前，后面使用定语从句，part后面省略的that/which作为play的宾语。第二空的what在宾语从句中作为like的宾语。故D正确。