问题标题：
英语选词填空What______________(washappening/happened)whilethey_______________(wereswimming/swam)intheriver
问题描述：
英语选词填空
What______________(washappening/happened)whilethey_______________(wereswimming/swam)intheriver
马游春回答：
What_______happened_______(washappening/happened)whilethey__wereswimming_____________(wereswimming/swam)intheriver
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