That art center is used to be a factory, millions of tractors were produced.A. what; whe

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(答案→)A. what; where
B. where; where
C. what; which
D. where; which
解析： 考查名词性从句及定语从句。第一空是表语从句，从句中缺少主语应用what，第二空为定语从句，先行词为a factory，从句中缺少地点状语，故用关系副词where，所以选A。