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

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

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

A．as   B．who  C．that D．what

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

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

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

1. A.
   as
2. B.
   who
3. C.
   that
4. D.
   what

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

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