Wang Lin failed to be admitted by Hong Kong University last year，and only then the importance of English.
A. he finally realized
B. he had realized
C. had he realized
D. did he realize
网友回答
A. he finally realized
B. he had realized
C. had he realized
(答案→)D. did he realize
解析：考查倒装句。Only放在句首，且强调状语时，句子要使用部分倒装。排除AB。再根据句意可知这里不能使用过去完成时，故D正确。句意：王林没有被香港大学录取。直到那时他才意识到英语的重要性。