except his parents 是插入语
真正的主语还是No one ，用believes 单三形式
to believe
expect to do sth的典型例子。
E.g.U should never expect him to tell the truth.(你永远别指望他说实话)
believes with
因为这里是\"信任\"的意思
believes
no one 是主语，believes是谓语。
believed
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