The Sutong Highway Bridge, a ________ bridge, is already open to traffic．

1. A.
   32 kilometre long
2. B.
   32-kilometre-long
3. C.
   32 kilometres long
4. D.
   32-kilometres-long

The Sutong Highway Bridge，a          bridge，is already open to traffic．

A．32 kilometre long                                     B．32-kilometre-long

C．32 kilometres long                                      D．32-kilometres-long