________ we are united, there is no difficulty we cannot overcome．

1. A.
   In order that
2. B.
   If only
3. C.
   So long as
4. D.
   Even if

________ we are united, there is no difficulty we cannot overcome.

A．In order that           B．If only                 C．So long as             D．Even if

       we are united，there is no difficulty we cannot overcome．

A．As if          B．Even though            C．As long as            D．After all