At that time, the calculator was a great / ?n?ven?n /.A. invent B. invitationC. invention D. inventor 题目和参考答案——青夏教育精英家教网—

题目内容

At that time, the calculator was a great ______ / ?n?ven?n /.

A. invent B. invitation

C. invention D. inventor

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