Classify the input text into either disfluent questions or proper questions. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

Why were Northern Chinese ranked higher?
proper

Taking evidence from witnesses is one of committees' what?
proper

When do um where do most students at the Groton School come from?

disfluent

