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：现代邮政英语时间：2022-01-30 21:01:05

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