问题补充：
Only when you are living in a foreign countrythe importance of English.
A. you can realize
B. you realized
C. did you realize
D. can you realize
答案：
A. you can realize
B. you realized
C. did you realize
(答案→)D. can you realize
解析：考查only 引起倒装，句子意思“仅仅当你生活在国外的时候你才能意识到英语的重要性”，
