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> 中国大学MOOC答案 > 8. But for many reasons, the technology was not ________ until more than 20 years later.

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

中国大学MOOC答案 数据帝 2024-05-08 扫描二维码

A、available
B、useful
C、realistic
D、genuine
喵查答案：available

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