He feels relaxed and even begins to whistle because        of the distance        covered.

A．three fifth; were                                         B．three fifth; was

C．three fifths; have been                     D．three fifths; has been

He feels relaxed and even begins to whistle because ________ of the distance ________ covered．

1. A.
   three fifth; were
2. B.
   three fifth; was
3. C.
   three fifths; have been
4. D.
   three fifths; has been