We should________the lights when we leave our classroom because we must save electricity. [ ] A. swi

题目简介

We should________the lights when we leave our classroom because we must save electricity. [ ] A. swi

题目详情

We should________the lights when we leave our classroom because we must save electricity.               
[     ]
A. switch on  
B. switch over  
C. switch off  
D. switch through
题型:单选题难度:中档来源:同步题

答案

C

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