Only as a translator how important it was to grasp English.A. when did I work; I realize

问题补充：

Only as a translator how important it was to grasp English.

A. when did I work; I realized

B. when did I work; did I realize

C. when I worked; I realized

D. when I worked; did I realize

答案：

A. when did I work; I realized

B. when did I work; did I realize

C. when I worked; I realized

D. when I worked; did I realize

解析：考查only的倒装句：only+状语（介词短语，副词，状语从句）后面的主句要部分倒装，这句话only+when引导的时间状语从句，（从句不倒装），后面的主句倒装，did提到主语前面，句意：只有当我做翻译的时候，我才知道掌握英语多么的重要。选D。