主句：I realized .
賓語從句：that I had done it wrong
狀語：when she told me all about Thisat once that 是做什么的從句是什么語序at once 作狀語，that引導賓語從句。 I had done it wrong 是個完成時的陳述句，這一句中，主語i,謂語 had done ,賓語 it ,wrong是賓語補足語。at once 是主句的狀語嗎？at once 是主句的狀語嗎？是的。