The whole world is fighting against the H1N1, a disease ________ has caused many deaths．

1. A.
   who
2. B.
   which
3. C.
   whom
4. D.
   what

The whole world is fighting against the H1N1, a disease ______ has caused many deaths．

A． who           B． which        C． whom            D． what

The whole world is fighting against the H1N1, a disease ____ has caused many deaths.

A．who          B．which              C．whom               D．what