--- He looks so tired. What’s wrong?
--- Nothing serious. He just stayed up last night, ___________his papers.
A.to prepare | B.having prepared | C.prepared | D.preparing |
相关知识点
推荐套卷
--- He looks so tired. What’s wrong?
--- Nothing serious. He just stayed up last night, ___________his papers.
A.to prepare | B.having prepared | C.prepared | D.preparing |