16．Much time __________ sitting at a desk，office workers are generally troubled by health problems．（　�。�
A．being spentB．having spentC．spentD．spending

分析 句意：因為大部分時間都坐在辦公桌前，所以辦公室職員一般都受健康問題的困擾．

解答 考查獨立主格結(jié)構(gòu)．由句子結(jié)構(gòu)可知，分詞的邏輯主語much time與主句主語office workers不一致，所以是獨立主格結(jié)構(gòu)．逗號后為主句，逗號前為獨立主格結(jié)構(gòu)作原因狀語．time與spend是被動關(guān)系，故填spent．

點評 解答此類題目首先要分析句子結(jié)構(gòu)找出主句，同時要注意主句的主語與分詞的邏輯主語是否一致，如果不一致，則為獨立主格結(jié)構(gòu)．然后再分析分詞的邏輯主語與動詞的主被動關(guān)系，主動用doing，被動用done．

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