AWhen Marconi demonstrated his Bwireless telegraph, he Cwas thinking not about broadcasting Dbut thought about rapid communicati

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问题 AWhen Marconi demonstrated his Bwireless telegraph, he Cwas thinking not about broadcasting Dbut thought about rapid communication.

选项 A、 
B、 
C、 
D、 

答案D

解析 But thought disrupts parallelism. The paired expression not...but joins two prepositional phrases: about broadcasting and about rapid communication. Correction: omit thought.
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