The speed______is 340 meters per second.

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问题 The speed______is 340 meters per second.

选项 A、at which sound travels
B、with which sound travels
C、of which sound travels
D、for which sound travels

答案A

解析 本题考查定语从句。句意:声音传播的速度是每秒340米。首先确定引导词用which,如果介词不前置的话,句子的顺序应该是the speed which sound travels at。与speed搭配的是介词at,故本题选A。
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