A wide range of postcards and other souvenirs are _______ sale in the visitors’ center.

       A．on                      B．at                        C．in                       D．of

A wide range of postcards and other souvenirs are _______ sale in the visitors’ center.

A．on            B．at             C．in             D．of

（天津六校一联模拟）A wide range of postcards and other souvenirs are ________ sale in the visitors' center.

1. A.
   on
2. B.
   at
3. C.
   in
4. D.
   of