单选题 Television has become quite a vigorous activity. Sitting up is exhausting so most people ______down while watching television.
【正确答案】 B
【答案解析】解析：形近词辨析。空格处所填单词应为谓语动词，根据句意，选项B和D符合题意，分析时态为一般现在时，故答案为B。