Only _______ as an interpreter _______ how important it was to practise speaking EnglishA.when did I work...I realizedB.when did I work...did 1 realizeC.when I work...did I realizeD.when I worked...did I realize
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D解析考查倒装句。Only 加状语放在句首，使用部分倒装，从句不倒装，主句倒装。根据题中的时态所以选D。