I'm glad________you．A.I meetB.meetC.to meetD.meeting
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C解析分析：glad是形容词，“be+形容词”后面出现动词的时候大部分情况下是跟to do，be glad后面的动词要用to do形式。(延伸)又如：be happy to do，be pleased to do，be sorry to do，be angry to do，be afraid to do，be sure to do，be able to do，be ready to do，be lucky to do，be surprised to do等。