What great fun it is to have a swim in a hot day in summer. A. aB. theC. /D. of

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A. a
B. the
(答案→)C. /
D. of
解析：考查冠词，fun是不可数名词，前面不加冠词，句型是：it‘s fun to do sth，what修饰fun，句意是;大热天游个泳是多么快乐的事啊。选C。