More and more students are going to have Friday afternoons________ to volunteer and help othersA.atB.inC.onD.off
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D解析试题分析：句意：越来越多的学生打算周五下午放假做志愿者帮助他人。have at 袭击、谴责；have sb.in 请某人来家; have it on sb.〔美国〕比(某人)强，胜过(某人)。have on 穿着；戴着。have...off是放假的意思，故选D。考点: 考查介词的用法。