It takes him several hours to do volunteer work each week.work out 表示“进展”是不及物动词,不能用被动语态.The volunteer work（takes ）（him）several hours each week. 意思是：他每个星期花几个小时的时间做义工. take 用来表示 花时间 cost 表示 花钱,不能表示 花时间
He spends several hours on volunteer work each week改为同义句
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he spends several hours on volunteer work each week
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this volunteer work takes each of them several hours a week(
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写出同义句：This volunteer work takes thern several hours a week.
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