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

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

出自：英语（专升本）

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