The vacuum tube, invented near the beginning of our century, gave us the use of radio waves, an ener
考试：MBA考试
科目：英语（在线考试）
问题：
A：was captured
B：captured
C：capturing
D：has been captured
答案：
解析：
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The vacuum tube, invented near the beginning of our century, gave us the use of radio waves, an ener
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