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

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

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

i()with my father at that time.i didnt know what ()A.was swimming;was happening B.am swimming;has happenedC.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,

C
happened 没有进行时态

C,我当时正在和爸爸一起游泳,表示当时正进行的动作。
不知道发生什么事情了。用一般过去时。

A
过去进行时:那时我正与我爸爸游泳。不知道发生什么( 指当时)
加油!不明白再问!如果帮到你,请采纳,谢谢!