他本可以成为一名医生的，但后来选择去读了法律。
He could have become a doctor, but he chose to study law instead.
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Could英 /kʊd/|美 /kʊd/
become英 /bɪˈkʌm/|美 /bɪˈkʌm/
解释
could + have + become 表示过去有可能成为医生但实际并未成为，could 是情态动词表过去可能性，have become 为完成不定式表示未实现的过去动作
He could have become a doctor, but he chose to study law instead.
could + have + become 表示过去有可能成为医生但实际并未成为，could 是情态动词表过去可能性，have become 为完成不定式表示未实现的过去动作