But for many reasons， the technology was not（）until more than 20 years later._精华吧

But for many reasons， the technology was not（）until more than 20 years later.

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But for many reasons， the technology was not（）until more than 20 years later.

A、available

B、useful

C、realistic

D、genuine

正确答案：available

Tag：时间：2023-10-07 15:09:59

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