The art center is used to be Factory 789 and millions of tractors were made.
A. what; where
B. where; where
C. that; which
D. where; which
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(答案→)A. what; where
B. where; where
C. that; which
D. where; which
解析:主要测试表语从句。有语境可知译文为:艺术中心位于过去时789工厂的地方,并且那儿生产过数百万的拖拉机。第一空主要测试句子 used to be Factory 789中缺少主语,另外充当表语;第二空主要测试句子 millions of tractors were made中缺少状语,而且充当表语。依据上面的分析以及所给答案可知选择A为最佳。