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【题目】Much time ________ sitting at a desk, office workers are generally troubled by health problems.

A.spentB.is spentC.has been spentD.having spent

【答案】A

【解析】

考查非谓语动词。句意:办公室职员长时间坐在办公桌前,通常都受到健康问题的困扰。本句已经存在谓语动词且句中没有连词,故spend在句中作非谓语动词,与逻辑主语time构成被动关系,故用过去分词spent。故选A

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