(单选题) Since 1780, when the town’s first hat factory ______ in Danbury, Connecticut, the town has been a center for hat manufacturing in the United States.(本题3.5分) A、 were established B、 was establishing C、 had been established D、 was established

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题目内容（大连工业大学-大学英语3）

(单选题) Since 1780, when the town’s first hat factory ______ in Danbury, Connecticut, the town has been a center for hat manufacturing in the United States.(本题3.5分)
A、 were established
B、 was establishing
C、 had been established
D、 was established

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河南工学院电机及拖动技术(高起专)