There is a new problem involved in the popularity of private cars_______ road conditions need to be improved

1. A.
   that
2. B.
   which
3. C.
   where
4. D.
   when

There is a new problem involved in the popularity of private cars_______ road conditions need to be improved.

A.that                   B.which                C.where                D.when

105. There is a new problem involved in the popularity of private cars _______ road conditions need to be improved.

  A. that        B. which        C. where        D. When

There is a new problem involved in the popularity of private cars ____ road conditions need to be improved.

A. that          B. which              C. where            D. when

There is a new problem involved in the popularity of private cars ____ road conditions need to be improved.
A．that B．which C．where D．when