It was in the lab ___was taken charge of by Mr. Harris ____they did the experiment.

A. which，that              B. that，which                     C. that，whom     D. which，where

It was in the lab____ was taken charge of by Mr Harris ____ they did the experiment.

It was in the lab ___was taken charge of by Mr.Harris____they did the experiment.

A.which，thatB.that，whichC.that，whomD.which，where

It was in the lab ________ was taken charge of by MR. Harris ________ they did the experiment.

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