No one in the department（ but Peter and I） knows that the director is going to resign.这里no one是主语，knows做它的谓语动词，that引导宾语从句，but Peter and I 可以理解为一个插入语：除了皮特和我
由 along with, as well as, as much as, accompanied by, except, but, in addition to, including, more than, rather than, together with, instead of, like 等引导的介词状语放在主语后，对主语的数不产生影响。
如：No one but you knows the truth.
The teacher as well as the students likes this novel.
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