Only when he failed in the final exam up his mind to study harder to catch up with the cla

问题补充：

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

答案：

A. he made

B. he had made

C. had he made

(答案→)D. did he make

解析：考查倒装句：only+状语置于句首，后面的句子用部分倒装，句意：只有当他期末考试失败，他才下决心更努力学校，赶上其他同学。说明用的是过去时，选D。