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【单选题】

According to the passage the new telephone communication system ______.
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
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根据网考网移动考试中心的统计,该试题:

4%的考友选择了A选项

17%的考友选择了B选项

3%的考友选择了C选项

76%的考友选择了D选项

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