Wang Lin failed to be admitted by Hong Kong University last year and only then the import

问题补充：

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

答案：

A. he finally realized

B. he had realized

C. had he realized

(答案→)D. did he realize

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