A few decades ago, the world banking community invented new Electronic Funds Transfer(EFT)systems to move money more efficiently

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问题     A few decades ago, the world banking community invented new Electronic Funds Transfer(EFT)systems to move money more efficiently across countries and around the globe. The 【1】benefit of such systems was to【2】the float of capital that was unavailable for 【3】checks were being cleared through banking【4】. Today, we understand that benefits of electronic banking are far more【5】than just reducing floating cash. The world of banking【6】revolutionize. It is【7】more efficient and faster, but more global. And now【8】the Internet, EFT systems are increasingly【9】with the new world of e-commerce and e-trade.
    【10】1997 and 2003, EFT value【11】from less than $50 trillion to nearly $400 trillion, more than the【12】economic product of all the countries and territories of the entire world. These statistics【13】should emphasize the true importance of transnational EFT. Satellite, wireless, and cable-based electronic fund transfers【14】the hub of global enterprise. Such electronic cash is【15】central to the idea of an emerging "worldwide mind". Without the satellite and fiber infrastructure to support the flow of electronic funds, the world economy would grind to a halt.
【6】

选项 A、is
B、has
C、has been
D、had been

答案C

解析 语法结构题(时态及主谓一致)。文章首句讲了“A few decades ago(几十年前)”电子基金转移系统的发明,第二句“Today,we understand that benefits of electronic banking…”叙述了从过去到现在“(EFT)systems”已经发生的变化,因此应该用现在完成时。故本题答案为C项has been。
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