Usd Tom to watch TV?他的回答到底是Yes,he used.还是yes,he used to

---- Did Tom use to watch TV?
---- Yes,he did./ No,he didn't.
说明：
因为 used to do sth.是“过去经常做某事”的意思,因此要用 did 来构成问句,回答时也要用did.