Because she buried herself in books, she didn't notice it was raining outside.
请问because从句里边,需要改成过去完成时吗?
不需要。例如:I did it because they asked me to do it. 我做这事是因为他们要我做。(摘自《薄冰英语惯用法词典》)在这个句子中,虽然 asked 这个动作在did 这个动作之前,但是 because 从句中的谓语动词并没有用过去完成时形式。