Research universities have to keep up with the latest computer and scientific hardware________ price.

A．not to mention  B．in addition to

C．on account of  D．regardless of

Research universities have to keep up with the latest computer and scientific hardware __________ price.

Research universities have to keep up with the latest computer and scientific hardware ________ price．

1. A.
   not to mention
2. B.
   in addition to
3. C.
   on account of
4. D.
   regardless of