我看到一句子The smartest thing Donald Trump has ever done is not release his tax returns

这句话是说：特朗普做过最聪明的事情是不公布他的退税

还是说：特朗普做过最聪明的事情并不是公布他的退税

另外还想请问下这句话中的release前面是不是省略了不定式to？

回答如下：

不定式作表语，如果前面句子由do的形式出现，后面不定式to可以省略

What you have to do is (to) peel the apple

What I really wanted to do was (to)drive all night.

What he wanted to do was(to) become a skillful worker.

The only thing I can do is (to) sleep in bed.

What I want to do is (to) have a good rest.

The only thing I want to do now is (to) lie in bed.

All that he can do is (to)wait

All I did in the factory was (to) wash bottles.