-Someone is knocking at the door, dad! -Go and see . A. who is it B. who it is C. who was it D. who
—Someone is knocking at the door, dad!
—Go and see ________.
A. who is it B. who it is C. who was it D. who it was
在线课程B
—Someone is knocking at the door, dad!
—Go and see ________.
A. who is it B. who it is C. who was it D. who it was
在线课程B