多一个that
改成：He asked his mother whether she knew what was going on then.
whether she knew what was going on then是个宾语从句,作谓语动词ask的宾语（直接宾语,表示问话内容）,whether本身可以引导宾语从句,不需要重复使用关联词了
he asked his mother that whether she knew what was going on
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