Much time _____ sitting at a desk, office workers are generally troubled by health problems. ( 章节：1 难度：2)_做题室

单项选择题Much time _____ sitting at a desk, office workers are generally troubled by health problems. ( 章节：1 难度：2): A、being spend; B、having spent; C、spent; D、spending

正确答案：B
答案解析：
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