---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A.did | B.has done | C.was doing | D.had done |
相关知识点
推荐套卷
---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A.did | B.has done | C.was doing | D.had done |