These countries will join one another against terrorism, was agreed to at the in

These countries will join one another against terrorism,      was agreed to at the international conference.

       A．as     B．who  C．that   D．what

试题答案

A

解析:

关系代词as引导非限制性定语从句，先行词为前面的一句话，意为：正如，正像。故选A。