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Ammonia______as the refrigerant in the first practical refrigerator, made by Kar
Ammonia______as the refrigerant in the first practical refrigerator, made by Kar
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2024-01-02
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问题
Ammonia______as the refrigerant in the first practical refrigerator, made by Karl von Linde in 1876.
选项
A、used
B、had used
C、is used
D、was used
答案
D
解析
The sentence needs a passive-voice verb; was used agrees in tense with the other verb in the sentence, made, and the time marker 1876.
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