What we need to do is 后跟 What we need to do is verify their nuclear declaration and we have put together a protocol that's based on international standards, Hill told reporters late Friday.I think
网友回答
应该是省略了to ,因为do前有to,此种情况下is后的to要省略,这是一种语法现象.
======以下答案可供参考======
供参考答案1:
What we need to do is (to) verify their nuclear declaration
What we need to do is (verifying) their nuclear declaration
What we need to do is (verification of) their nuclear declaration
不能省略to,原句错误