Only when he failed in the final exam ____up his mind to study harder to catch up with the classmates ahead of him.

A．he made

B．he had made

C．had he made

D．did he make

さんざん悩み（　　　）、今の会社を辞めることにした。

A．ぬいて

B．あげく

C．かけて

D．結果