I admit that there are problems, _______I don't agree that they cannot be solved.?

A. While        B. If              C. In case              D. Before?

. ________ I admit that there are problems, I don’t agree that they cannot be solved.

A. While          B. If                 C. As                D. Unless

      I admit that there are problems, I don’t agree that they cannot be solved.

A．While          B．When           C．As             D．For

I admit that there are problems, ________ I don’t agree that they cannot be solved．

1. A.
   while
2. B.
   if
3. C.
   in case
4. D.
   before

I admit that there are problems, _______I don't agree that they cannot be solved.

1. A.
   While
2. B.
   If
3. C.
   In case
4. D.
   Before