这里是系表结构 be + succsessful （形容词） 的过去完成时,把be 动词改为had been 即可
可以改为：
.had been a success (指成功的事【手术】）
不可以改为 had succeeded ,因为 主语his operation 不是动词succeed 的执行者
he asked his doctor to tell him whether his operation had be
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