Question

Your shoes ________, you need a new pair.

1. A.
   wear out
2. B.
   worn out
3. C.
   are worn out
4. D.
   is worn

Answer 1

C
物体作主语，所以谓语动词要用被动语态，又由主语是复数，所以用are worn out表示“穿坏”。