i()with my father at that time.i didnt know what ()

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i()with my father at that time.i didnt know what ()
A.was swimming;was happening B.am swimming;has happened
C.was swimming;happened D.swam;was happening

选择C
解析：at that time “在那个时候”,为过去进行时的标志性短语,所以第一个空填was swimming,故排除B和D选项.
另外,happen是短暂性动词,而不是延续性动词,所以happen不能用于进行时态,所以排除A选项.
综上分析,正确答案为C
翻译为：我和我爸爸那时候正在游泳,不知道发生了什么.
如果对你有所帮助的话,

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