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外语
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
2009-04-15
61
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
D
解析
由文章第三段可以得知,1977年人们试验成功,因此试验应该是在1977年之前就已经开始进行了的。
转载请注明原文地址:https://kaotiyun.com/show/K58d777K
本试题收录于:
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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