While Iwas reading a book,an alien came into my room.改为一般疑问句,要怎么改?

While Iwas reading a book,an alien came into my room.改为一般疑问句,要怎么改?

题目
While Iwas reading a book,an alien came into my room.改为一般疑问句,要怎么改?
While I was reading a book,an alien came into my room.
答案
Did an alien come into your room while you were reading a book?
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