There is / are ___________. 选择一项： A. various difficulties in keeping the Internet security B. worldwide common regulations to maintain cyberspace security C. no serious security issues in the Internet industry

There is / are ___________.

选择一项：
A. various difficulties in keeping the Internet security
B. worldwide common regulations to maintain cyberspace security
C. no serious security issues in the Internet industry

出自：人文英语2

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