A. The electric telegraph was eventually replaced by wireless radio-wave transmission and the telephone.
B. Guglielmo Marconi perfected a type of radio technology.
C. In a wireless transmission, electromagnetic waves are sent over the airwaves by a system of transmitters.
D. In 1844, the telegraph was used to send the worlds first telegram.
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Home » English » Which sentence has a verb in the active voice? A. The electric telegraph was eventually replaced by wireless radio-wave transmission and the telephone. B. Guglielmo Marconi perfected a type of radio technology. C.