In the following sentence:
昨天晚上我们在一起聊天，___忽然停电了。
To fill in the blank, I picked up 说着说着, but the correct answer was 躺着躺着.
The other two candidates were 跳着跳着 and 走着走着, and I even think these are correct as well... because the electrocity can suddenly stop even if you jump, walk, speak, or laid down.
Why is 躺着躺着 correct here? And what is the reason the verb + 着 is repeated here?
We say "verb 着 verb 着" to express that "In the middle of (our) doing sth."
So 躺着躺着就停电了 means "When we were lying, the electricity went out." (Or "In the middle of our lying...")
Usually this means "In the middle something" so don't use it if you mean "when we have just started sth."
According to this context, 说着说着 is correct to me. 昨天晚上我们在一起聊天，说着说着忽然停电了。 The hint is 聊天, so either 聊着聊着 or 说着说着 makes sense in the context.
...着...着 means 'while (doing) ...'.
You are not wrong and I would actually prefer your answer to 躺着躺着, but of course as others suggested, 聊着聊着 is the best.
Don't worry about it, at your age, you should have seen loads of nonsense answers like this in art/literature subjects. The question setter is either foolish or careless.
