The vacuum tube, invented near the beginning of our century, gave us the use of radio waves, an ener
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问题：
A：was captured
B：captured
C：capturing
D：has been captured
答案：
解析：
【解析】本句的主干是 The vacuum tube...gave ...and later opened ...；invented near the beginning of our century表达 invented...是过去分词短语作后置定语，对前面的tube做补充说明；an energy source 表达an...是同位语，对前面的radio waves做解释说明；never before( )表达never...是后置定语，修饰限定其前面的energy source,考虑到energy source与capture的“被动关系”，可首先排除C；再考虑到本句的谓语动词是并列的gave和opened,由此断定不会再出现新的动词，进而排除A和D (除非这两者前面有定语从句引导词that),综上，本题答案选B,即never before captured这一过去分词短语作前面an energy source的后置定语。
【点睛】过去分词短语作后置定语。
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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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