问题补充：
I can’t see the blackboard. Can you the light?
A. turn on
B. turn off
C. put on
D. put off
答案：
(答案→)A. turn on
B. turn off
C. put on
D. put off
解析：turn on打开，发动； turn off关掉，拐弯；put on穿上，上演；put off推迟，阻止。句意：我不能看见黑板。你能打开灯吗？结合语境可知选A。
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