Radio waves traveling at the speed of light ______their discoveries to Earth.A、h

游客2025-02-04 27

问题 Radio waves traveling at the speed of light ______their discoveries to Earth.

选项 A、have brought
B、are brought
C、bringing
D、is bringing

答案 A

解析 The present perfect verb have brought is the only answer that fits the meaning of the sentence.

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