--_____ in your bag?-- Apples.请问这个空应该填What's 还是 What are

--_____ in your bag?-- Apples.请问这个空应该填What's 还是 What are
--_____ in your bag?-- Apples.请问这个空应该填What's 还是 What are

--_____ in your bag?-- Apples.请问这个空应该填What's 还是 What are
答案：What's.
如果单独用what/who引导特殊疑问句,其谓语动词一律用单数形式.
再如对We're on duty today.中的we划线提问,为：Who is on duty today?

what's

What's.这个疑问句是对物品进行提问的，所以是What's.