（对划线部分提问）David and Linda have been watching TV for four hours.（watching TV划线）
David and Linda have been watching TV for four hours.（watching TV划线）
_____ _____ David and Linda _____ _____ for four hours?
人气：437 ℃ 时间：2019-11-04 17:42:59
解答
What have ……been doing
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