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According to the passage, people started to make glass ______. According to the passage the new telephone communication system
According to the passage, people started to make glass ______. According to the passage the new telephone communication system
admin
2009-03-15
70
问题
According to the passage, people started to make glass ______.
According to the passage the new telephone communication system ______.
选项
A、has been put into actual use
B、was put into actual use in 1977
C、was put on experiment in 1977
D、had been repeatedly experimented on before 1977
答案
C
解析
第三段第一句……,the new system was used successfully in an experiment in Chicago in 1977.答案选C。
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公共英语二级笔试题库公共英语(PETS)分类
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公共英语二级笔试
公共英语(PETS)
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