Last summer I took a course on poisonous gases.
A. what to deal with
Bhow to deal with
C. what to be dealt with
Dhow to be dealt with
网友回答
A. what to deal with
(答案→)B. how to deal with
C. what to be dealt with
D. how to be dealt with
解析：考查词语搭配。How to deal with; what to do with是两个固定结构。