---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.
A.may; must | B.will; can | C.can; may | D.may; will |
---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.
A.may; must | B.will; can | C.can; may | D.may; will |