问题
选择题
Don't forget _____ the lights when you leave the classroom. It saves electricity (电).[ ]
A. to turn off
B. turning off
C. to turn on
D. turning on
答案
答案：A
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Don't forget _____ the lights when you leave the classroom. It saves electricity (电).[ ]
A. to turn off
B. turning off
C. to turn on
D. turning on
答案：A