It's not polite to have your guests________all the time．A.standB.to standC.standingD.stood
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C解析分析：have解释为“让”“使”时有宾语补语的结构：have sb do sth(让某人做某事)(不带to的动词不定式)，相当于make sb do sth；have sb doing sth(让某人一直做某事)，相当于keep sb doing sth；have sth done(让某事被做)(宾语补语是过去分词)。本题应该理解为“让客人一直站着”，所以要用have sb doing sth的结构。(延伸)下面这句就要用have sb do sth的结构：The teacher had us stand up．(注意stand up是个短暂的动作。)