问题
选择题
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
答案
答案：C
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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
答案：C