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Radio waves traveling at the speed of light ______their discoveries to Earth.A、h
Radio waves traveling at the speed of light ______their discoveries to Earth.A、h
游客
2024-01-02
55
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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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