It's difficult to ________ a conversation with someone who only says“yes”or“no”.A.pick upB.put upC.keep upD.give up
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C解析句意：和那些只说“是”或“不”的人交谈简直太难了。pick up--start again; continue重新开始；继续，如：We'll pick up where we finished yesterday.我们从昨天停止的地方继续进行。put up意为：升起或举起某物，建造或设立等；keep up使……保持不衰；give up放弃。