( )You should turn the lights when we leave the room . A. on B. to C. off
选出恰当的的答语,并将其字母代号填入问句前的括号里
Mei mei : This is my new desk. Chen Jie:
Lucy : How many lights are there in the classroom. Lily :
Sarah : Where is my seat? Mary:
John : let‘s clean the desks. Tom :