The vacuum tube, inveed near the beginning of our ceury, gave us the use of radio waves, an energy s
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, inveed near the beginning of our ceury, gave us the use of radio waves, an energy s
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