Only as an interpreter how important it is to learn English well. A. when did I

 Only _______ as an interpreter（口译者）______ how important it is to learn English well.
    A. when did I work；I realized           B. when I worked；I realized
    C. when did I work；did I realize         D. when I worked；did I realize

试题答案

 D  only加状语从句放在句首，要注意前不倒，后倒。故选D。