Mr. Hopkins hasn’t yet answered my question      I can go with him to       he calls the Underground.

A．that; which         B．that; where        C．whether; that          D．whether; what

Mr．Hopkins hasn’t yet answered my question ________ I can go with him to ________ he calls the Underground．

1. A.
   that; which
2. B.
   that; where
3. C.
   whether; that
4. D.
   whether; what