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题目内容
（英语（专升本））
4.People are advised to use a programmed time-switch because _______.
A)it will save electricity
B)they need to know exactly what time it is
C)this often frighten burglars
D)in this way nobody will know that the owner of the house is away for a long time
A)it will save electricity
B)they need to know exactly what time it is
C)this often frighten burglars
D)in this way nobody will know that the owner of the house is away for a long time
参考答案