画线部分提问,he read a book when it raining画线滴是read a book

What did he do when it was raining?

这个句子应该是He was reading a book when it began raining.
对reading a book提问，应该是：What was he doing when it began raining?
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句子有问题。正确的英文表达应为： He was reading a book when it started to rain. 如果颠倒顺序，有有点不符合逻辑了，即： He read a book when it was raining. 但是，若在颠倒的句子里加上特定的时间，那句子就符合逻辑了。比如， He read a book when it was raining all day yesterday (昨天下了一整天的雨，他(无所事事)读了本书)。

回答你的问题：
What was he doing when it started to rain?

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你这个句子应该不对吧

这个句子确实有错误.句子可能是 ：He was reading a book when it was raining.
那么提问的方式是：What was he doing when it was raining?
如果原句是：He read a book when it's raining.
那么提问的方式是：What did he do when it's raining?当然,这里的it's 是it was的省略方式