题目内容（请给出正确答案）

[主观题]

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.

A、were established

B、was establishing

C、had been established

D、was established

提问人：网友heysein 发布时间：2022-01-07

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