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

There is / are ___________.

选择一项：

A.
various difficulties in keeping the Internet security

B.
no serious security issues in the Internet industry

C.
worldwide common regulations to maintain cyberspace security

出自：国家开放大学人文英语2

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