---Do you have any plan for this summer vacation, Mary?---Sure, I’ d like to be a volunteer and help to ______ the Central Park.A.put upB.call upC.clean upD.cheer up
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C解析考查词组。put up 张贴，举起：call up 打电话；clean up 清理，cheer up 使兴奋；这里句意：我想成为一名志愿者帮助清理中心公园。