Last summer I took a course on poisonous gases.A. what to deal withBhow to deal withC.

问题补充：

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

答案：

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。