问题补充：
--- Did you hear someone talking in the living room?
--- Oh, I forgot to the TV just now.
A. switch off
B. switch on
C. turn on
D. switch over
答案：
(答案→)A. switch off
B. switch on
C. turn on
D. switch over
解析：考查词组辨析：A. switch off关掉B. switch on打开C. turn on打开D. switch over交换位置，句意：--你听到有人在起居室说话吗？--我忘了关掉电视了。选A。
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