Last summer I took a course on ______ poisonous gases.
A.what to deal with | B. how to deal with |
C.what to be dealt with | D. how to be dealt with |
相关知识点
推荐套卷
Last summer I took a course on ______ poisonous gases.
A.what to deal with | B. how to deal with |
C.what to be dealt with | D. how to be dealt with |