We meant to finish the work by dark, but we were so tired that we could not ______.

    A. hold on       B. last on        C. carry on      D. keep to

We meant to finish the work by dark, but we were so tired that we could not ______.

1. A.
   hold on
2. B.
   last on
3. C.
   carry on
4. D.
   keep to