Only after he had an operation on his heart _____ he should do st_英语解答

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，

人气：102 ℃　时间：2020-04-08 07:14:12

解答

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.
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