Question

---________ you________ go shopping in the supermarket?

---Yes, I did.

1. A.
   Were; used to
2. B.
   Did; used to
3. C.
   Used; to
4. D.
   Did; use to

Answer 1

D
used to的疑问句式有两种，即：Did...use to...?或used...to...?而该题的答语是“Yes, I did.”所以选择D。