Only after he had an operation on his heart _____ he should

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Only after he had an operation on his heart _____ he should do sth.for others in the rest of his life.
A.he had realized.B.had he realized.C.he realized.D.did he realized
本人对这个句式看不太明白,
对对对，题抄错了，是realize，

很高兴能为你解答疑惑.
答案选：D,理由如下：
此题的考点为：倒装句 Only（提至句首）+状语……后半句用倒装格式,所以在BD之间进行选择.
时态上,前半句有he had an operation（做手术）为过去式,这里没有特殊情况,所以前后时态要一致,所以选D的过去时.
希望我的回答能够帮助到你,祝你学业顺利.
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【科技英语强手团】

Only after he had an operation on his heart _____ he should He had an amused look on his face.He have an amused look on Only when he arrived home _____ that he had left his key in He asked his doctor to tell him whether his operation had be Only after he had spoken out the word did he realize he had After finishing his homework he went on _____ a letter to hi He wore his heart on his sleeve 中文? He had just sent an email to his pal on the Internet __ After his long journey,he _____ his home yesterday. should he need an operation, she ___ (take) to the hospital. should he need an operation,she ___ (take) to the hospital. He got home right after his father had died.