It was in the schoolhe had studiedhe began the important experiment. A. that;whereB. inwhi

问题补充：

It was in the schoolhe had studiedhe began the important experiment.

A. that;where

B. inwhich;which

C. where;that

D. where;inwhich

答案：

A. that;where

B. inwhich;which

(答案→)C. where;that

D. where;inwhich

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