题目内容

用when, where, why填空。
1. I will never forget the day ______ I joined the army.
2. This is the factory ______ my father worked 30 years ago.
3. A birthday is the date ______ one was born.
4. Do you know the reason ______ no one questioned Aristotle's theory then?
1. when  2. where  3. when  4. why
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