After graduating from a university．I paid a visit to was once our primary school the worke

问题补充：

After graduating from a university．I paid a visit to was once our primary school the workers use as a store．

A. which，where

B. where；that

C. what；that

D. where；which

答案：

A. which，where

B. where；that

(答案→)C. what；that

D. where；which

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