The 12th Five-Year Plan (2011-2015) said a system _____ to protect people's secrets on line. [ ]A. would be developed B. has been developedC. was developed -高中英语-魔方格

◎ 题干

The 12th Five-Year Plan (2011-2015) said a system _____ to protect people's secrets on line.

A. would be developed
B. has been developed
C. was developed
D. had been developed

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◎ 解析

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◎ 知识点

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