I got into trouble again. Only then ________ that I should have followed my parents’ advice.
A．I realizedB．did I realizeC．realized ID．had I realized
B

試題分析：考查特殊句式中的倒裝。Only加介詞短語、副詞或時間狀語，謂語句首時，用部分倒裝，A沒倒裝；C是全部倒裝；排除A、C；only then只有在那時，是過去的時間，沒有過去的動作，所以不用過去完成時，排除D。故選B。
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