What did Cosgrove do before he became a teacher teaching history? It can be inferred from the passage that______.

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问题 What did Cosgrove do before he became a teacher teaching history?
It can be inferred from the passage that______.

选项 A、the task for Cosgrove is quite heavy.
B、the students are enthusiastic about history study.
C、the students has little interest in history study.
D、West Milford once was a factory town.