(2013·陕西宝鸡二检)Not until he went abroad for further study how attached he was to his parents.
A. that the realized
B. had he realized
C. did he realize
D. that he had realized
网友回答
A. that the realized
B. had he realized
(答案→)C. did he realize
D. that he had realized
解析：选C 考查倒装和时态。句意：直到去国外深造他才意识到他有多么依恋父母。当not until位于句首时，句子要倒装，另外，根据句中的“went”和“was”可知，此处应用一般过去时。故选C。