In the nineteenth century, the invention of the telegraph made it possible to send noises, signals, and even music over wires fr

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问题    In the nineteenth century, the invention of the telegraph made it possible to send noises, signals, and even music over wires from one place to another. 【C1】______, the human voice had never traveled this way. Many inventors tried to find a【C2】______to send a voice over wires, and in 1876 some of their【C3】______were crowned with (使圆满结束) success. Two American【C4】______, Alexander Graham Bell and Elisha Gray, 【C5】______at almost the same time. The United States【C6】______Court finally had to decide which of the two【C7】______the first inventor of the telephone. The Court decided【C8】______Bell’s favor.
   Born in Edinburg, Scotland, Bell grew up in a family【C9】______was very interested in teaching people to【C10】______. His grandfather had been an actor who left【C11】______to teach elocution (雄辩术) ; his father was a teacher who helped deaf-mutes learn【C12】______to speak.
   However, probably none of the【C13】______inventions gave Bell the same feeling of triumph 【C14】______he had on the day【C15】______he spilled some acid from his batteries. It was after he had worked for months【C16】______he found ways to send something more【C17】______metallic twangs (“嘣”的一声) over the wires. Thinking Watson, his helper, was in the next room, Bell called, "Mr. Watson, 【C18】______. I want you. " Watson was not in the next room. He was down in his laboratory, 【C19】______to the receiver. To Watson’s【C20】______, he heard the words perfectly. He ran to tell Bell the news: the wires had carried Bell’s voice perfectly.
【C16】

选项 A、that
B、when
C、which
D、however

答案A

解析 结构衔接题。本空所在句开头的it was,以及空前后句子成分完整可知,本句为强调句型,即it was…that…结构,故答案为that。
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