题目内容：
Much time _____ sitting at a desk, office workers are generally troubled by health problems.
A．being spent B．having spent
C．spent
D．spending
参考答案：
答案解析：
单选题：Much time _____ sitting at a desk, office workers are genera
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- 题目类型：单选题
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B．having spent
C．spent
D．spending