It was in the lab __________was in the charge of Professor Smith __________they carried out the experiment.

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

It was in the lab __________was in the charge of Professor Smith __________they carried out the experiment.

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

It was in the lab __________was in the charge of Professor Smith __________they carried out the experiment.

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

 It was in the lab ______was in the charge of Professor Smith ______they carried out the experiment.

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