Only when he was refused by the interviewer the importance of knowing English.
A. did he realize
B. he realized
C. had he realized
D. was he realized
网友回答
(答案→)A. did he realize
B. he realized
C. had he realized
D. was he realized
解析：考查倒装句。Only放在句首，且强调状语的时候，使用部分倒装的形式。本题都符合这两个条件，故排除BD。C项的时态错误。句意：只有当他被面试者拒绝的时候，他才意识到了解英语的重要性。故A正确。