问题补充：
How long did you spend TV last night?
A. watch
B. watched
C. to watch
D. Watching
答案：
A. watch
B. watched
C. to watch
(答案→)D. Watching
解析：句意：你昨天晚上看电视看了多久？Spend time doing sth意为“做某事花了多少时间”；故选D。
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