It could be interpreted as "你的网上小店都卖什么东西啊?" So 都 is actually not modifying the subject. You can think of the sentence as "What are (all) the things you sell in your online store?"
What is the role of 都 in this sentence?
2 Answers By Expert Tutors
(gramma)都:1,all, both
2, entirely (due to) each,always,generally
3,even(indicates that the speaker thinks that the time is late, the time is long, the age is old,
and the quantity is large)
For your question:你的网上小店都卖什么东西啊?"
你的小店卖 = your little shop sells ✅
都卖 = all sell ❌
Why? this 都 It belongs to the gramma2 entirely (due to) each,always ,generally, the pattern is 每...都,like 每天...都,每年...都,每次...都,etc
The concequence is: 你的网上小店都卖什么东西啊?What does your little shop generally sell?
Hopefully it is clear for you to understand your question. Welcome new more questions.
Still looking for help? Get the right answer, fast.
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.