Some of the roads were flooded, _________ made our journey more difficult.

A. which               B. it               C. what         D. that

Some of the roads were flooded, ________ made our journey more difficult．

1. A.
   which
2. B.
   it
3. C.
   what
4. D.
   that

Some of the roads were flooded, _________ made our journey more difficult.

A. which               B. it               C. what         D. that